阅读说明：本技术 分光光度计 (Spectrophotometer ) 是由 上挂惟史 于 2018-08-27 设计创作，主要内容包括：本发明提供一种分光光度计,对于该分光光度计,能够利用两个盖容易地打开开口的在试样室的第1方向和第2方向的部分,并且能够防止在使一盖成为打开状态时另一盖成为打开状态。第1盖(31)在受到的来自第1保持机构(33)的保持力的作用下以保持于第2盖(32)的状态成为关闭状态。第2盖(32)在受到的来自第2保持机构(34)的保持力的作用下以保持于壳体(10)的状态成为关闭状态。通过克服受到的来自第2保持机构(34)的保持力地对第2盖(32)施加力,能够将第2盖(32)从壳体(10)卸下。保持力被设定为：在使第1盖(31)从关闭状态成为打开状态时,能够在第2盖(32)保持于壳体(10)的状态下解除第2盖(32)对第1盖(31)的保持。(The invention provides a spectrophotometer capable of easily opening the parts of an opening in the 1 st direction and the 2 nd direction of a sample chamber by using two covers, and preventing one cover from being in an open state when the other cover is in the open state. The 1 st lid (31) is in a closed state in a state of being held by the 2 nd lid (32) by a holding force received from the 1 st holding mechanism (33). The 2 nd cover (32) is in a closed state in a state of being held in the housing (10) by a holding force received from the 2 nd holding mechanism (34). The 2 nd cover (32) can be detached from the housing (10) by applying a force to the 2 nd cover (32) against the holding force received from the 2 nd holding mechanism (34). The holding force was set to: when the 1 st cover (31) is opened from the closed state, the 2 nd cover (32) can release the holding of the 1 st cover (31) by the 2 nd cover (32) in a state where the 2 nd cover (32) is held by the housing (10).)

1. A spectrophotometer is characterized in that a light source is arranged in a housing,

the spectrophotometer includes:

a housing in which a sample chamber having a light entrance and exit is formed and which has openings that open the sample chamber in the 1 st and 2 nd directions;

a 1 st cover for opening and closing a portion of the opening in the 1 st direction of the sample chamber;

a 2 nd cover for opening and closing a portion of the opening in the 2 nd direction of the sample chamber;

a 1 st holding mechanism for holding one of the 1 st cover and the 2 nd cover in a closed state; and

a 2 nd holding mechanism for holding the other of the 1 st lid and the 2 nd lid in a closed state,

the one cover is kept in the other cover to be in a closed state by the holding force from the 1 st holding mechanism,

the other cover is kept in the housing to be in a closed state by the holding force received from the 2 nd holding mechanism, and the other cover can be detached from the housing by applying a force to the other cover against the holding force received from the 2 nd holding mechanism,

the holding force is set to: when the one cover is changed from the closed state to the open state, the holding of the one cover by the other cover can be released in a state where the other cover is held by the housing,

the holding force of the 2 nd holding mechanism to the 2 nd cover is set to be larger than the holding force of the 1 st holding mechanism to the 1 st cover,

the 2 nd holding mechanism has a magnet for generating the holding force in a direction parallel to a surface of the other cover.

2. The spectrophotometer of claim 1,

the 1 st holding mechanism has a magnet for generating the holding force.

3. The spectrophotometer of claim 1,

the other cover has a guide portion for positioning when the other cover is mounted to the housing.

4. The spectrophotometer of claim 1,

the cover is detachable from the housing.

Technical Field

The present invention relates to a spectrophotometer comprising: a housing in which a sample chamber having a light entrance and exit is formed and which has openings that open the sample chamber in the 1 st and 2 nd directions; and a cover for opening and closing the opening.

Background

In a fourier transform infrared spectrophotometer (FTIR), which is an example of a spectrophotometer, light from a light source is interfered to generate interference light, and the interference light is irradiated to a sample in a sample chamber. Then, the transmitted light or the reflected light from the sample is received by a detector, and the spectrum is measured.

Such a spectrophotometer generally includes a housing in which a sample chamber is formed and a cover for opening and closing the sample chamber (see, for example, patent document 1 below). The housing is formed with openings that open the sample chamber in the 1 st direction (e.g., upward) and the 2 nd direction (e.g., lateral direction), and the openings are opened and closed by a cover. Various fittings are disposed in the sample chamber. When the attachment/detachment of the accessory to/from the spectrophotometer is performed, the accessory is attached/detached to/from the sample chamber through the opening with the lid open.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2006-250836

Disclosure of Invention

Problems to be solved by the invention

In some cases, the spectrophotometer performs measurement in a state where gas such as carbon dioxide or water vapor is removed from the sample chamber. In such a case, if the opening of the sample chamber is opened entirely, the atmosphere in the sample chamber is greatly changed, and therefore, it may be preferable to open only a part of the opening (particularly, only the upper side). In addition, even when only a simple operation is performed in the sample chamber, it is preferable that only a part of the opening can be opened.

Therefore, a spectrophotometer is proposed which: the cover is divided into a 1 st cover and a 2 nd cover, and the sample chamber can be opened by opening only one cover. In the case of such a spectrophotometer, for example, the opening above the sample chamber can be opened and closed by the 1 st lid (upper surface lid), and the opening on the side of the sample chamber can be opened and closed by the 2 nd lid (side lid).

For example, when a simple operation is to be performed in the sample chamber, when an operation is to be performed in the sample chamber with fluctuations in the atmosphere in the sample chamber suppressed, only the upper surface cover is opened. On the other hand, when a large-sized component is to be attached to and detached from the sample chamber, not only the upper surface cover but also the side surface covers need to be opened.

In the conventional spectrophotometer, the upper surface cover has the following structure: for example, the cover is rotatably attached to the housing so as to be easily opened and closed. On the other hand, the side cover has the following structure: for example, the cover is attached to the housing by a fastener such as a screw, and the cover can be opened by detaching the fastener as necessary. Therefore, the conventional spectrophotometer has the following problems: both the upper surface cover and the side cover cannot be easily opened.

Therefore, it is also conceivable to adopt a structure in which the side cover can be attached and detached without using a fixing member so that both the upper surface cover and the side cover can be easily opened. However, in this case, there is a problem that the side cover is also opened when the upper cover is opened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a spectrophotometer capable of easily opening openings of sample chambers in the 1 st direction and the 2 nd direction by two covers and preventing one cover from being opened when the other cover is opened.

Means for solving the problems

(1) The spectrophotometer of the present invention includes a case, a 1 st cover, a 2 nd cover, a 1 st holding mechanism, and a 2 nd holding mechanism. The housing has a sample chamber formed therein and having a light entrance and exit, and has openings that open the sample chamber in the 1 st and 2 nd directions. The 1 st cover opens and closes a portion of the opening in the 1 st direction of the sample chamber. The 2 nd cover opens and closes a portion of the opening in the 2 nd direction of the sample chamber. The 1 st holding mechanism is for holding one of the 1 st lid and the 2 nd lid in a closed state. The 2 nd holding mechanism is for holding the other of the 1 st lid and the 2 nd lid in a closed state. The one cover is kept in the other cover by the holding force from the 1 st holding mechanism, and the one cover is closed. The other cover is kept in the housing in a closed state by the holding force received from the 2 nd holding mechanism, and the other cover can be detached from the housing by applying a force to the other cover against the holding force received from the 2 nd holding mechanism. The holding force is set to: when the one cover is brought from the closed state to the open state, the holding of the one cover by the other cover can be released in a state where the other cover is held by the housing.

With this configuration, the 1 st lid can open the 1 st direction portion of the opening of the sample chamber, and the 2 nd lid can open the 2 nd direction portion of the opening of the sample chamber. One of the 1 st lid and the 2 nd lid is in a closed state in a state of being held by the other lid, and the opening can be easily opened by releasing the holding force. The other cover is closed in a state of being held by the housing, and the opening can be easily opened by releasing the holding force. Further, when the one cover is opened, the other cover can be released from holding the one cover in the state where the other cover is held in the housing, and therefore the other cover can be prevented from being opened.

(2) At least one of the 1 st holding mechanism and the 2 nd holding mechanism may have a magnet for generating the holding force.

With this structure, at least one of the 1 st cover and the 2 nd cover can be held in the closed state by the magnet. The holding force of the magnet can be easily released by applying a force that overcomes the holding force, and therefore the opening can be more easily opened.

(3) The other cover may have a guide portion for positioning when the other cover is attached to the housing.

With this configuration, when the other cover is attached to the housing and the other cover is closed while being held by the housing, the positioning can be easily performed by the guide portion. Therefore, the opening and closing of the opening can be more easily performed.

(4) The cover may be detachable from the housing.

With this configuration, since both the 1 st cover and the 2 nd cover are detachable from the housing, the opening can be largely opened by detaching both the covers from the housing. This prevents the 1 st lid and the 2 nd lid from becoming an obstacle when, for example, a large accessory is attached to and detached from the sample chamber.

ADVANTAGEOUS EFFECTS OF INVENTION

With the present invention, the opening can be easily opened by releasing the holding force between one of the 1 st lid and the 2 nd lid and the other lid, and the opening can be easily opened by releasing the holding force between the other lid and the housing. Further, according to the present invention, when the one cover is opened, the holding of the one cover by the other cover can be released in a state where the other cover is held by the housing, and therefore, the other cover can be prevented from being opened.

Drawings

Fig. 1 is a perspective view showing an external configuration of a spectrophotometer according to an embodiment of the present invention.

Fig. 2 is a diagram for explaining the opening and closing operation of the lid, and shows a state in which the 1 st lid is opened.

Fig. 3 is a diagram for explaining the opening and closing operation of the cover, and shows a state in which the 1 st cover is removed from the housing.

Fig. 4 is a diagram for explaining the opening and closing operation of the cover, and shows a state where both the 1 st cover and the 2 nd cover are removed from the housing.

FIG. 5 is a side view of a spectrophotometer, partially shown in cross-section.

Fig. 6 is an external view of the 1 st cover, showing a bottom view.

Fig. 7 is an external view of the 1 st cover, showing a left side view.

Fig. 8 is an external view of the 1 st cover, showing a right side view.

Fig. 9 is an external view of the 2 nd cover, showing a rear view.

Fig. 10 is an external view of the 2 nd cover, showing a left side view.

Fig. 11 is an external view of the 2 nd cover, showing a right side view.

Description of the reference numerals

1. A spectrophotometer; 10. a housing; 11. an upper surface; 12. a front surface; 20. a sample chamber; 24. an opening; 30. a cover; 31. 1, a cover; 32. a 2 nd cover; 33. 1 st holding mechanism; 34. a 2 nd holding mechanism; 211. an injection port; 221. an ejection port; 321. a guide section; 322. a groove; 331. a magnet; 332. a metal part; 341. a magnet; 342. a metal portion.

Detailed Description

1. Appearance structure of spectrophotometer

Fig. 1 is a perspective view showing an external configuration of a spectrophotometer 1 according to an embodiment of the present invention. The spectrophotometer 1 is, for example, a fourier transform infrared spectrophotometer (FTIR), and is divided into rectangular parallelepiped-shaped housings 10. A sample chamber 20 is formed inside the housing 10, and the sample chamber 20 can be opened and closed by a cover 30.

The user can perform work on the housing 10 from the front. The cover 30 is provided across the upper surface 11 and the front surface 12 of the housing 10, and the upper side (1 st direction) and the front side (2 nd direction) of the sample chamber 20 can be opened by opening the cover 30. In the present embodiment, the cover 30 is configured by a 1 st cover 31 that covers the upper side of the sample chamber 20 and a 2 nd cover 32 that covers the front side of the sample chamber 20.

The housing 10 is a hollow member and has accommodating portions 13, 14, and 15 for accommodating various components on both left and right sides and a rear side with respect to the sample chamber 20. Specifically, a michelson interferometer (not shown) is disposed in the housing section 13 on the right side of the sample chamber 20, and interference light generated by the michelson interferometer is incident on the sample chamber 20. A detector (not shown) is disposed in the housing portion 14 on the left side of the sample chamber 20, and light emitted from the inside of the sample chamber 20 is detected by the detector. A control board and the like for controlling the operation of the spectrophotometer are disposed in the housing portion 15 at the rear of the sample chamber 20.

In the sample chamber 20, a gas such as carbon dioxide or water vapor may be removed by purging with nitrogen or dehumidifying with a desiccant. In this case, measurement is performed by the spectrophotometer 1 in a state where the sample chamber 20 is filled with nitrogen gas or dry air. There are also cases where: the lid 30 is opened and closed in a state where the sample chamber 20 is filled with nitrogen gas or dry air.

2. Opening and closing operation of lid

Fig. 2 to 4 are diagrams for explaining the opening and closing operation of the lid 30. Fig. 2 shows a state where the 1 st cover 31 is opened, fig. 3 shows a state where the 1 st cover 31 is removed from the housing 10 in the middle, and fig. 4 shows a state where both the 1 st cover 31 and the 2 nd cover 32 are removed from the housing 10.

As shown in fig. 2 to 4, the sample chamber 20 is defined by a right side surface 21, a left side surface 22, and a rear side surface 23. An entrance 211 for allowing the interference light from the michelson interferometer to enter the sample chamber 20 is formed on the right side surface 21. An exit hole 221 through which light is emitted from the sample chamber 20 to the detector is formed in the left side surface 22. In this manner, the sample chamber 20 having the light entrance 211 and the light exit 221 is formed in the housing 10.

The upper surface of the sample chamber 20 is open, and one of the four sides is open. In the present embodiment, an opening 24 that opens the upper side and the front side of the sample chamber 20 is formed, and the opening 24 is opened and closed by the cover 30 (the 1 st cover 31 and the 2 nd cover 32). That is, the 1 st cover 31 opens and closes the opening 24 at a portion above the sample chamber 20, and the 2 nd cover 32 opens and closes the opening 24 at a portion in front of the sample chamber 20. The opening 24 is formed continuously from above the sample chamber 20 to the front.

In a state where at least one of the 1 st cover 31 and the 2 nd cover 32 is opened, a fitting (not shown) is attached to and detached from the sample chamber 20 through the opening 24. Examples of the accessory include a sample holder and a container for holding a sample, and a measuring mechanism including a plurality of mirrors. Examples of the measuring means include a total reflection measuring means, a specular reflection measuring means, a diffuse reflection measuring means, a transmission measuring means, and a minute sample measuring means.

The 1 st lid 31 and the 2 nd lid 32 can be opened and closed independently. As shown in fig. 2, if only the 1 st cover 31 is opened, the upper side of the sample chamber 20 can be opened with the front side of the sample chamber 20 closed by the 2 nd cover 32. In the present embodiment, as shown in fig. 3, the 1 st cover 31 can be detached from the housing 10. As shown in fig. 4, the 2 nd cover 32 can be removed from the housing 10 to open the front of the sample chamber 20.

3. Concrete structure of cover

Fig. 5 is a side view of spectrophotometer 1, shown partially in phantom. Fig. 6 to 8 are external views of the 1 st cover 31, fig. 6 showing a bottom view, fig. 7 showing a left side view, and fig. 8 showing a right side view. Fig. 9 to 11 are external views of the 2 nd cover 32, fig. 9 shows a rear view, fig. 10 shows a left view, and fig. 11 shows a right view.

As shown in fig. 1 to 11, the 1 st lid 31 is held in a closed state by the 1 st holding mechanism 33, and the 2 nd lid 32 is held in a closed state by the 2 nd holding mechanism 34. The 1 st lid 31 is in a closed state (the state of fig. 1 and 5) in a state of being held by the 2 nd lid 32 by the holding force received from the 1 st holding mechanism 33. On the other hand, the 2 nd cover 32 is in a closed state (the state of fig. 1 to 3 and 5) in a state of being held in the housing 10 by the holding force received from the 2 nd holding mechanism 34.

The 1 st holding mechanism 33 includes a magnet 331 and a metal portion 332. The magnet 331 is, for example, a permanent magnet, and is attached to the 2 nd cover 32. On the other hand, at least a part of the metal part 332 is made of a magnetic material, and the metal part 332 is attached to the 1 st cover 31. The magnet 331 and the metal portion 332 are provided at positions opposing each other when the 1 st cover 31 is in the closed state. Therefore, when the 1 st lid 31 is closed, the magnet 331 and the metal portion 332 are brought into close contact with each other by the magnetic force (holding force), and the 1 st lid 31 is held in the 2 nd lid 32 in a closed state.

As shown in fig. 7 and 8, a bearing 311 is formed at the rear end of the left side surface of the 1 st cover 31, and a bearing 312 is formed at the rear end of the right side surface of the 1 st cover 31. Support shafts 313 are formed at positions corresponding to the bearing portions 311 and 312 of the 1 st cover 31, respectively, on the rear side edge of the upper end portion of the opening 24 of the housing 10 (see fig. 3 and 4). The support shaft 313 protrudes from a side edge of the opening 24 so as to extend in the left-right direction, and is fitted into the bearing portions 311, 312. Thereby, the 1 st cover 31 can be rotated about the support shaft 313.

As shown in fig. 7, the bearing portion 311 formed on one side surface (left side surface in this example) of the 1 st cover 31 is formed of a cylindrical wall surface. Therefore, even if the 1 st cover 31 is attempted to be moved in a direction (vertical direction, front-rear direction, and the like) orthogonal to the horizontal direction in a state where the support shaft 313 is fitted in the bearing portion 311, the 1 st cover 31 cannot be moved because the support shaft 313 is locked to the bearing portion 311.

On the other hand, as shown in fig. 8, a bearing 312 formed on the other side surface (in this example, the right side surface) of the 1 st cover 31 has a cutout 314 formed in a part of the cylindrical wall surface. Thus, when the 1 st cover 31 is attempted to be moved in the direction orthogonal to the left-right direction in a state where the support shaft 313 is fitted into the bearing 312, the 1 st cover 31 is moved only when a force is applied in a certain direction, and the bearing 312 can be removed from the support shaft 313.

In this example, as shown in fig. 2, when the 1 st cover 31 is in an open state, that is, when the 1 st cover 31 extends in the vertical direction, the notch 314 of the bearing 312 is located on the lower side. In this state, by lifting the right end portion of the 1 st cover 31 upward, the bearing 312 can be detached from the support shaft 313 as shown in fig. 3. Thereafter, if the 1 st cover 31 is moved in the right direction, the bearing portion 311 can be detached from the other support shaft 313. In this manner, in the present embodiment, the 1 st cover 31 can be attached to and detached from the housing 10.

As shown in fig. 6, the metal portion 332 of the 1 st holding mechanism 33 has a washer portion 333 and a threaded portion 334. The washer 333 is an annular member, and the washer 333 and the screw 334 can be attached to the 1 st lid 31 by inserting the screw 334 into the washer 333 and screwing the screw 334 into the 1 st lid 31.

As shown in fig. 9, the magnet 331 of the 1 st holding mechanism 33 is held by a catcher (japanese: キャッチャー) 335. The catcher 335 includes a cylindrical housing 336 and a rod-shaped yoke 337 inserted into the housing 336. The magnet 331 is provided on the upper end surface of the yoke 337. The magnet 331 and the catcher 335 constitute a so-called magnetic catcher (japanese: マグネットキャッチ). In fig. 10 and 11, the magnetic catcher is not shown.

The yoke 337 is movable in the vertical direction with respect to the housing 336 fixed to the 2 nd lid 32, and is biased upward by a spring (not shown) provided in the housing 336. When the yoke 337 is pressed downward by a certain amount against the urging force of the spring, the yoke 337 is locked at this position. In this state, when the yoke 337 is pushed downward again, the lock is released, and the yoke 337 moves upward by the biasing force of the spring.

That is, when the 1 st lid 31 is closed as shown in fig. 1 and 5, the yoke 337 of the catcher 335 is moved downward and locked by the metal portion 332 of the 1 st holding mechanism 33 by pressing down the front end portion of the 1 st lid 31, and the 1 st lid 31 is in a closed state in the locked state. In this state, the magnet 331 and the metal part 332 are brought into close contact with each other by the magnetic force.

When the 1 st lid 31 is to be opened, the front end portion of the 1 st lid 31 is pushed downward to release the lock, and the yoke 337 is moved upward by the biasing force of the spring. Thereby, the front end portion of the 1 st cover 31 moves upward, and the user can grip the front end portion. In this state, although the magnet 331 and the metal portion 332 are kept in close contact with each other by the magnetic force, the tip portion of the 1 st cover 31 is lifted upward against the magnetic force, and the 1 st cover 31 is pivoted about the support shaft 313, whereby the 1 st cover 31 can be opened as shown in fig. 2.

The 2 nd holding mechanism 34 includes a magnet 341 and a metal portion 342. The magnet 341 is, for example, a permanent magnet, and is attached to the housing 10. On the other hand, at least a part of the metal part 342 is made of a magnetic material, and the metal part 342 is attached to the 2 nd cover 32. The magnet 341 and the metal portion 342 are provided at positions opposite to each other when the 2 nd cover 32 is in the closed state. Therefore, when the 2 nd cover 32 is closed, the magnet 341 and the metal part 342 are closely attached by the magnetic force (holding force), and the 2 nd cover 32 is held in the closed state by the casing 10.

As shown in fig. 9 to 11, guide portions 321 are formed at the upper ends of both right and left side surfaces of the 2 nd cover 32. Grooves 322 are formed in the proximal side edges of the upper end of the opening 24 of the housing 10 at positions corresponding to the respective guide portions 321 of the 2 nd cover 32 (see fig. 4). The guide portions 321 protrude from the side surface of the second cover 32 so as to extend in the left-right direction, and are fitted into the grooves 322 from above. Thereby, the 2 nd cover 32 is positioned to extend in the vertical direction, and in this state, the 2 nd cover 32 is attached to the housing 10, and is in a closed state.

A protrusion 323 protruding downward is formed on the lower end surface of the 2 nd lid 32. In this example, two protrusions 323 are provided at intervals, but one protrusion 323 may be provided, or three or more protrusions may be provided. Recesses 324 are formed at positions corresponding to the respective projections 323 of the 2 nd cover 32 on the lower end edge of the opening 24 of the housing 10 (see fig. 4). When the 2 nd cover 32 is attached to the housing 10 and the 2 nd cover 32 is in the closed state, each projection 323 is inserted into the corresponding recess 324.

When the 2 nd lid 32 is to be opened, the 2 nd lid 32 is urged upward against the magnetic force (holding force) received from the magnet 341 of the 2 nd holding mechanism 34. Thereby, the 2 nd cover 32 is detached from the housing 10, and the 2 nd cover 32 is opened as shown in fig. 4.

As shown in fig. 9, the metal portion 342 of the 2 nd holding mechanism 34 has a washer portion 343 and a threaded portion 344. The washer portion 343 is an annular member, and the washer portion 343 and the screw portion 344 can be attached to the 2 nd lid 32 by inserting the screw portion 344 into the washer portion 343 and screwing the screw portion 344 into the 2 nd lid 32.

In the metal part 342 of the 2 nd holding mechanism 34, both the washer part 343 and the screw part 344 are formed of a magnetic body (ferromagnetic body). In contrast, in the metal portion 332 of the 1 st holding mechanism 33, only one of the washer portion 333 and the screw portion 334 is formed of a magnetic body, and the other is formed of a non-magnetic body. In this example, the washer part 333 is formed of a magnetic body, and the screw part 334 is formed of a non-magnetic body. As the magnetic material, iron can be exemplified, and as the nonmagnetic material, stainless steel can be exemplified, but the present invention is not limited thereto.

According to the above configuration, when comparing the 1 st holding mechanism 33 and the 2 nd holding mechanism 34, the holding force of the 2 nd holding mechanism 34 with respect to the 2 nd cover 32 is set to be larger than the holding force of the 1 st holding mechanism 33 with respect to the 1 st cover 31. As a result, when the 1 st cover 31 is changed from the state (closed state) of fig. 1 to the state (open state) of fig. 2, the 2 nd cover 32 can release the holding of the 1 st cover 31 with the 2 nd cover 32 held in the housing 10.

Preferably, the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 are provided in the same plane substantially parallel to the 2 nd cover 32. Further, it is preferable that the direction of releasing the holding force of the 1 st holding mechanism 33 is the same as the direction of releasing the holding force of the 2 nd holding mechanism 34. In this example, the direction of releasing the holding force of the 1 st holding mechanism 33 and the direction of releasing the holding force of the 2 nd holding mechanism 34 are both vertical directions, but the present invention is not limited to this, and other directions are possible.

4. Effect of action

(1) In the present embodiment, the portion of the opening 24 above the sample chamber 20 can be opened by the 1 st cover 31, and the portion of the opening 24 in front of the sample chamber 20 can be opened by the 2 nd cover 32. The 1 st lid 31 is in a closed state in a state of being held by the 2 nd lid 32, and the opening 24 can be easily opened by releasing the holding force. The 2 nd cover 32 is in a closed state in a state of being held by the housing 10, and the opening 24 can be easily opened by releasing the holding force. Further, when the 1 st cover 31 is opened, the 2 nd cover 32 can release the holding of the 1 st cover 31 in the state where the 2 nd cover 32 is held in the housing 10, and therefore the 2 nd cover 32 can be prevented from being opened.

(2) In particular, in the present embodiment, the 1 st cover 31 and the 2 nd cover 32 can be held in the closed state by the magnets 331 and 341. The holding force of the magnets 331, 341 can be easily released by applying a force that overcomes the holding force, and therefore the opening 24 can be more easily opened.

(3) In the present embodiment, when the 2 nd cover 32 is attached to the housing 10 and the 2 nd cover 32 is closed while being held in the housing 10, the positioning can be easily performed by the guide portion 321. Therefore, the opening/closing of the opening 24 can be performed more easily.

(4) In the present embodiment, since both the 1 st cover 31 and the 2 nd cover 32 are detachable from the housing 10, the opening 24 can be opened widely as shown in fig. 4 by detaching both the covers 31 and 32 from the housing 10. This prevents the 1 st cover 31 and the 2 nd cover 32 from being obstructed in the case where a large-sized accessory is to be attached to or detached from the sample chamber 20.

5. Modification example

In the above embodiment, the following configuration is explained: the difference in the holding force between the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 is caused by the difference in the material of the washer portion 333 of the metal portion 332 and the washer portion 343 of the metal portion 342. However, the present invention is not limited to this configuration, and may be configured as follows: for example, the holding forces of the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 are different by making the number of the magnets 331 and the magnets 341 of the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 different or making the sizes of the magnets 331 and 341 different.

The 1 st holding mechanism 33 and the 2 nd holding mechanism 34 are not limited to the configuration in which the holding force is generated by the magnetic force, and may be configured to generate a holding force other than the magnetic force. For example, at least one of the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 may be configured to generate a holding force by a pair of members fitted to each other. In this case, by appropriately setting the force of fitting the pair of members (force required for releasing the fitting), the holding forces of the 1 st holding mechanism 33 and the 2 nd holding mechanism 34 can be made different.

In the above embodiment, the configuration in which the opening 24 is formed in the upper surface 11 and the front surface 12 of the housing 10 is explained. However, the present invention is not limited to this configuration, and the opening 24 may be formed from the upper surface 11 of the housing 10 to another side surface (left side surface, right side surface, or rear surface). In this case, the 2 nd cover 32 is not limited to the structure for opening and closing the portion of the opening 24 in front of the sample chamber 20, and may be a structure for opening and closing the portion of the opening 24 on the other side (left, right, or rear) of the sample chamber 20. The 1 st direction is not limited to the upper direction, and the 2 nd direction is not limited to the side direction (front, left, right, or rear), and may be configured such that the sample chamber 20 can be opened in two different directions.

The structure for detachably attaching the 1 st cover 31 to the housing 10 is not limited to the structure using the bearing portions 311 and 312 as described above, and may be detachably attached by another structure. Further, the 1 st cover 31 may not be detachable from the housing 10.

Further, the configuration is not limited to the configuration in which the 1 st cover 31 is in the closed state in the state of being held by the 2 nd cover 32 and the 2 nd cover 32 is in the closed state in the state of being held by the housing 10, and the configuration may be such that the 2 nd cover 32 is in the closed state in the state of being held by the 1 st cover 31 and the 1 st cover 31 is in the closed state in the state of being held by the housing 10. In this case, the holding force of the 1 st holding mechanism for holding the 2 nd cover 32 in the closed state and the holding force of the 2 nd holding mechanism for holding the 1 st cover 31 in the closed state may be set to: when the 2 nd cover 32 is opened from the closed state, the 1 st cover 31 can release the holding of the 2 nd cover 32 with the 1 st cover 31 held in the housing 10.

In the above embodiment, the fourier transform infrared spectrophotometer was described as an example of the spectrophotometer 1, but the present invention can be applied to other spectrophotometers such as an ultraviolet-visible-infrared spectrophotometer.