JP2015121441A - Spectroscopy apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a positional deviation of optical components positioned by reducing a strain of a housing generated by screwing a lid member on a plurality of sites of the housing.SOLUTION: A spectroscopy apparatus comprises: a plurality of optical components 2-5 used for spectroscopy; a housing 6 which has an opening H1 for fixing or positioning the optical components 2-5, and to which the plurality of optical components 2-5 are fixed; a lid member 7 closing the opening H1 and fixed to one site of the housing 6; and a pressing mechanism 10 pressing the lid member 7 against the housing 6 by elastic force.

Description

  The present invention relates to a spectroscopic device that is an optical device in which optical components such as a diffraction grating and a concave mirror are accommodated in a housing.

  As shown in Patent Document 1, a conventional spectroscope contains a plurality of optical components such as slits, reflection mirrors, diffraction gratings, and photodetectors in a casing, and the positions of these components are adjusted in the casing. After being fixed. Specifically, with the lid member removed from the housing, the optical component is positioned and fixed in the housing, and then the lid member is screwed to the housing at multiple locations (two or more points). Yes.

  However, when the lid member is fixed to the casing with screws at a plurality of locations, the casing is distorted as the plurality of screws are fastened. In addition, when the ambient temperature changes due to the difference in thermal expansion coefficient and heat capacity between the casing and the lid member, stress is applied to the casing and the casing is distorted. When the housing is distorted, the position of the optical component fixed to the housing changes and the adjustment is out of order, resulting in a wavelength shift of the spectrometer.

  Note that it is possible to reduce the distortion and displacement of the casing due to screwing of the lid member by increasing the rigidity (mechanical strength) of the casing and the optical component itself. Optical parts become large and heavy.

JP 2002-318158 A

  Accordingly, the present invention has been made to solve the above-described problems, and reduces the distortion of the casing that occurs when the lid member is screwed to a plurality of locations of the casing. Preventing deviations is the main desired issue.

That is, a spectroscopic device according to the present invention includes a plurality of optical components used for spectroscopy, an opening for fixing or adjusting the position of the optical components, and a housing to which the plurality of optical components are fixed, A lid member that closes the opening and is fixed to one position of the casing, and a pressing mechanism that presses the lid member against the casing by an elastic force to closely contact each other are provided. .
Here, as a configuration for fixing the lid member to one place of the housing, for example, fixing using a screw, fixing using a caulking, fixing using a nail, fixing using an adhesive or an adhesive, etc. are considered. It is done.

In such a case, since the lid member is fixed at one position of the casing, the casing is hardly distorted due to the fixing of the lid member, and also due to a change in ambient temperature when the spectroscopic device is used. The distortion of the casing due to the difference between the thermal expansion coefficient and the heat capacity of the casing and the lid member hardly occurs. Thereby, it is possible to prevent the wavelength shift of the spectroscopic device caused by the positional shift of the adjusted optical component.
In addition, since the lid member is pressed and closely adhered to the housing by the pressing mechanism, it is possible to prevent the lid member from being easily lifted by fixing at one place, and the opening can be reliably closed.
Furthermore, since the lid member is not structured to be screwed to the housing at a plurality of locations, measures such as increasing the wall thickness to increase the mechanical strength of the housing are not required in order to reduce the distortion effect caused by screwing. can do.

A rotation limiting mechanism provided between the casing and the lid member and preventing the lid member fixed at one position of the casing from rotating relative to the casing; Is desirable.
If it is this, it can prevent that the cover member which closed the opening part rotates centering around the part fixed in one place, such as a screw circumference, and an opening part opens.

The pressing mechanism is configured by an elastic member that is provided in the housing and presses the lid member in a state in which the opening is closed, and the elastic member constitutes the rotation limiting mechanism. desirable.
If this is the case, the pressing mechanism and the rotation limiting mechanism can be configured by a single elastic member, and the configuration of the spectroscopic device can be simplified.

As a specific embodiment of the rotation limiting mechanism, the rotation limiting mechanism includes the elastic member and a recess formed in the lid member, and the elastic member contacts the inner surface of the recess. Accordingly, it is desirable that rotation of the lid member with respect to the housing is prevented. In particular, it is desirable that the elastic member is configured to come into contact with a surface of the inner surface of the recess that faces the rotation direction of the lid member.
In this case, the rotation angle of the lid member can be further reduced by configuring the elastic member to contact the surface facing the rotation direction on the inner surface of the recess.

  In order to reduce the size of the spectroscopic device, it is preferable that at least one optical component is fixed to the inner surface of the side wall of the casing. Thus, in the configuration in which the optical member is fixed to the side wall, the effect of the present invention becomes more remarkable.

  According to the present invention configured as described above, it is possible to reduce the distortion of the casing that occurs when the lid member is screwed to a plurality of locations of the casing, and to prevent the positional deviation of the optical component whose position has been adjusted. .

The figure which shows the state which removed the cover member of the spectrophotometer of this embodiment. The figure which shows the state which attached the cover member of the spectrophotometer of the embodiment. Sectional drawing which mainly shows the press mechanism of the embodiment. The perspective view which shows the press mechanism and rotation limitation mechanism of the embodiment.

  An embodiment of a spectrophotometer using a spectroscopic device according to the present invention will be described below with reference to the drawings.

  The spectrophotometer of the present embodiment is used in, for example, a gas concentration measuring device that measures a gas concentration. As shown in FIGS. 1 and 2, as a plurality of optical components, an incident slit 2, two reflections are used. Mirrors (concave mirrors) 3a and 3b, a diffraction grating 4 and a photodetector 5 are provided, and the plurality of optical components 2 to 5 are housed and fixed in a housing 6 made of, for example, aluminum. The light detector 5 is a line sensor (multi-channel detector) in which a plurality of light receiving elements for detecting light of each wavelength dispersed by the diffraction grating 4 are arranged in a line shape on the left and right, for example.

  The housing 6 has a substantially box shape with one surface (upper surface in the present embodiment) opened, and the side wall 6b to the bottom wall 6a and the side wall 6b formed so as to surround the entire periphery of the top surface of the bottom wall 6a. 6e. And the opening part H1 is formed by the upper end part of these side surrounding walls 6b-6e, The said opening part H1 is obstruct | occluded with the iron cover member 7, for example. In this housing 6, the entrance slit 2 is fixed to the front side wall 6b, and the two reflecting mirrors (concave mirrors) 3a and 3b are fixed to the rear side wall 6c. Further, the diffraction grating 4 and the photodetector 5 are fixed to the bottom wall 6a.

  Specifically, the entrance slit 2 is provided in the vicinity of the light introduction port formed in the front side wall 6b, and the first reflection mirror (concave mirror) 3a that reflects the light that has passed through the entrance slit 2 is the front side wall. It is provided on the inner surface of the rear side wall 6c opposite to 6b. The light reflected by the first reflecting mirror 3a provided on the inner surface of the rear side wall 6c is split by the diffraction grating 4 provided on the front side wall 6b side. The split light is reflected by a second reflecting mirror (concave mirror) 3b provided on the inner surface of the rear side wall 6c. The light reflected by the second reflecting mirror 3b is detected by the photodetector 5 provided on the front side wall 6b side. The plurality of light receiving elements of the photodetector 5 are provided corresponding to each wavelength separated by the diffraction grating 4.

  The lid member 7 has a flat plate shape and is screwed to one location of the housing 6. Specifically, the lid member 7 is a flat plate that covers the planar upper surface of the side peripheral walls 6b to 6e of the housing 6, and is, for example, via one female screw hole 8 (see FIG. 1) formed in the right side wall 6d. It is fixed by one fixing screw 9 (see FIG. 2). That is, the right side portion of the lid member 7 is fixed to the housing 6 by the fixing screw 9. By fixing the lid member 7 to the housing 6 at one point in this way (stopping at one point), a difference in thermal expansion occurs between the lid member 7 and the housing 6 made of different materials due to a change in ambient temperature. However, it can expand freely in the plane direction around the fixing screw 9. That is, the fixing part (one-point stopper) by the fixing screw 9 becomes a starting point of thermal expansion deformation, and the housing 6 and the lid member 7 move relatively. In other words, the fixing with the fixing screw 9 is to fix the fixing portion so as to be a starting point of thermal expansion deformation.

  Further, in this embodiment, the lid member 7 screwed in one place is prevented from floating from the opening H1 of the housing 6 and external light entering the inside or preventing the lid member 7 from rattling. For this purpose, a pressing mechanism 10 that presses the lid member 7 against the housing 6 is provided.

  The pressing mechanism 10 is provided on the housing 6 or the lid member 7, and presses the lid member 7 against the housing 6 with an elastic force so as to be in close contact therewith. Specifically, the pressing mechanism 10 allows the movement of the lid member 7 in the plane direction (horizontal direction) around the fixing screw 9 with respect to the housing 6, and causes the lid member 7 to face downward in the vertical direction with respect to the housing 6. Is pressed (pressed toward the opening H1). Here, the pressing force of the lid member 7 on the housing 6 by the pressing mechanism 10 is configured to be smaller than the fixing force of the lid member 7 on the housing 6 by the screw 9. The pressing mechanism 10 of the present embodiment is provided on the outer surface of any of the side peripheral walls 6b to 6e of the housing 6, and is an elastic member 101 that presses the upper surface of the lid member 6 with the opening H1 closed downward. It is comprised by.

  Specifically, as shown in FIG. 1 and FIG. 2, the elastic member 101 presses a position different from the fixing position by the fixing screw 9, more preferably a position facing the fixing position, in the plan view of the lid member 7. In this embodiment, the front side surface and the left side corner portion of the lid member 7 or the upper surface in the vicinity thereof is pressed. More specifically, as shown in FIGS. 3 and 4, the elastic member 101 is fixed to the front wall 6b side of the outer surface of the left side wall 6e by, for example, screws, and is a plate bent inwardly above the left side wall 6e. It is constituted by a spring. The elastic member 101 has a fixed piece portion 101a fixed to the left side wall 6e and a movable piece portion 101b that applies an elastic return force to the upper surface of the lid member 7 continuously from the upper end of the fixed piece portion 101a. doing. Thereby, the elastic member 101 presses the upper surface of the lid member 6 in a state where the opening H <b> 1 is closed downward to bring the lid member 7 into close contact with the upper surfaces of the side peripheral walls 6 b to 6 e of the housing 6.

  In the present embodiment, the lid member 7 provided between the housing 6 and the lid member 7 and screwed to one location of the housing 6 is prevented from rotating with respect to the housing 6. A rotation limiting mechanism 11 is further provided.

  The rotation limiting mechanism 11 includes an elastic member 101 of the fixing mechanism 10 and a recess 71 formed in the lid member 7. The concave portion 71 is formed on the side surface of the lid member 7 toward the inside. Specifically, the concave portion 71 has a width dimension slightly larger than the width dimension of the elastic member 101 on the left side surface of the lid member 7. Is formed. Further, in the state where the opening H1 of the housing 6 is closed (a state where the lid member 7 is fixed by the fixing screw 9), at least a portion where the concave portion 71 is formed extends outward from the outer surface of the left side wall 6d. I'm out. Thereby, a part of the elastic member 101 extending upward from the left side wall 6 e of the housing 6 is accommodated in the recess 71. When the lid member 7 rotates with respect to the housing 6, the inner surface of the recess 71, specifically, the front inner surface 71 a or the rear inner surface 71 b (the surface facing the rotation direction) is the end in the width direction of the elastic member 101 ( The rotation of the lid member 7 is restricted by contacting the front and rear end portions. Note that a slight gap is formed between the inner surface of the recess 71 and the elastic member 101 in order to ensure free expansion in the planar direction of the lid member 7.

  Next, the assembly of the spectrophotometer 1 of this embodiment will be briefly described.

  First, in a state where the lid member 7 is removed from the housing 6 (a state where the opening H1 is opened), the entrance slit 2, the first reflecting mirror 3a, the second reflecting mirror 3b, and the diffraction grating are formed inside the housing 6. 4. Attach the photodetector 5 and adjust its position. Thereafter, the lid member 7 is inserted so as to be sandwiched between the upper surface of the housing 6 and the elastic member 101, and is screwed to the housing 6 with a fixing screw 9. As a result, the lid member 7 is screwed to the housing 6 at one location and is pressed against the housing 6 by the pressing mechanism 10 at one location. Thus, in the present embodiment, the lid member 7 can be fixed to the housing 6 with one fixing screw 9.

  According to the spectrophotometer 1 configured as described above, since the lid member 7 is fixed to the housing 6 at one location by the fixing screw 9, the housing 6 is hardly distorted due to the fixing of the lid member 7. In addition, the housing 6 is less likely to be distorted due to a difference in thermal expansion coefficient or heat capacity between the housing 6 and the lid member 7 due to a change in ambient temperature during use. Thereby, the wavelength shift of the spectroscopic device caused by the positional shift of the adjusted optical components 2 to 5 can be prevented.

  In addition, since the lid member 7 is pressed and closely adhered to the housing 6 by the pressing mechanism 10, it is possible to prevent the lid member 7 from being easily lifted and rattled by screw fixing at one place, and the opening H1 can be reliably secured. Can be occluded.

  Furthermore, since the lid member 7 is not structured to be screwed to the housing 6 at a plurality of locations, measures such as increasing the wall thickness to increase the mechanical strength of the housing 6 in order to reduce the distortion effect caused by screwing, etc. Can be made unnecessary.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the elastic member 101 serving as the pressing mechanism 10 is fixed to the housing 6. However, the elastic member 101 is fixed to the lid member 7 and locked to a part of the housing, thereby applying an elastic force. It may be what you do. Further, the pressing mechanism 10 may be provided outside the housing 6 and the lid member 7 without providing the pressing mechanism 10 on the housing 6 and the lid member 7. For example, an elastic member serving as the pressing mechanism 10 may be provided on a peripheral member such as a rack on which the housing 6 is mounted, and the lid member may be pressed against the housing by the elastic member.

  Further, the rotation limiting mechanism 11 is configured by accommodating a part of the elastic member 101 in the recess 71 formed on the side surface of the lid member 7, but the movable member of the elastic member 101 is movable on the upper surface of the lid member 7. You may comprise by forming the recessed part which the contact part of the piece part 101b fits. Further, the rotation limiting mechanism 11 may be configured such that the elastic member 101 is in contact with the side surface of the lid member 7 without forming the recess 71 in the lid member 7.

  Further, the pressing mechanism 10 and the rotation limiting mechanism 11 may be provided separately. In this case, the rotation restricting mechanism 11 may be provided on one of the housing 6 or the lid member 7 and may have a contact piece that contacts the other of the housing 6 or the lid member 7.

  In addition, the position where the lid member 7 is screwed is not limited to the above embodiment, and may be any position on the side peripheral walls 6b to 6e of the housing 6. Here, in order to minimize the positional deviation of the reflection mirrors 3a and 3b due to screwing, a position away from the reflection mirrors 3a and 3b is desirable, for example, facing the side wall provided with the reflection mirrors 3a and 3b. A wall that can be considered.

  Furthermore, in the said embodiment, although the cover member 7 was fixed to the housing | casing 6 in one place using the fixing screw 9, the structure which fixes the lid member 7 to one place of the housing | casing 6 is used. As long as it can be fixed so that the fixing part becomes the starting point of thermal expansion deformation, fixing using caulking, fixing using nail, fixing using adhesive or adhesive, etc. good. In the case of configuring the spectroscopic device, it is desirable to fix using a fixing screw or fix using an adhesive or an adhesive.

  In addition, in the above-described embodiment, the spectroscopic device has been described. In addition, an optical device such as an interferometer in which a plurality of optical components such as a slit, a reflection mirror, a diffraction grating, and a photodetector are fixed in a housing. It can also be applied to.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Spectrophotometer 2 ... Incident slit 3 ... Reflection mirror (concave mirror)
DESCRIPTION OF SYMBOLS 4 ... Diffraction grating 5 ... Photo detector 6 ... Housing | casing H1 ... Opening part 7 ... Cover member 8 ... Female screw hole 9 ... Fixing screw 10 ... Pressing mechanism 11 ... Rotation limiting mechanism

Claims (5)

A plurality of optical components used for spectroscopy;
A housing having an opening for fixing or adjusting the position of the optical component, and the plurality of optical components being fixed;
A lid member that closes the opening and is fixed to one location of the housing;
A spectroscopic device comprising: a pressing mechanism that presses the lid member against the casing by an elastic force to closely contact the casing.   And a rotation limiting mechanism that is provided between the casing and the lid member and prevents the lid member fixed at one position of the casing from rotating relative to the casing. Item 1. The spectroscopic device according to Item 1. The pressing mechanism is configured by an elastic member that is provided in the casing and presses the lid member in a state of closing the opening.
The spectroscopic apparatus according to claim 2, wherein the elastic member constitutes the rotation limiting mechanism.   The rotation limiting mechanism includes the elastic member and a concave portion formed in the lid member, and the elastic member contacts the inner surface of the concave portion, whereby rotation of the lid member with respect to the casing is performed. The spectroscopic device according to claim 3, which is prevented.   The spectroscopic device according to claim 1, wherein at least one optical component is fixed to an inner surface of the side wall of the housing.