JPH1114877A - Optical analyzing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the attachment and detachment of an optical element such as a lens and to prevent the optical element from being damaged when demounted. SOLUTION: A cylindrical pedestal 23 where the optical element 1 is inserted and extracted is formed around the circular opening 20 of a fixed base 2. Fitting openings 24 are provided at two 180 deg. opposite places of the outer periphery of the pedestal 23 and an engagement step 25 which is hollowed toward the inner peripheral side is formed below the outer peripheral wall of a frame body 21. A pressure member 3, on the other hand, is fitted onto the outer periphery of the frame body 21 and when a claw 33 at its lower end edge engages the engagement step, the internal surface of an end surface part 32 presses the top surface of the optical element 1. Consequently, the optical element 1 is clamped between the fixed base 2 and pressure member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical analyzer such as a spectrophotometer and a polarimeter, and more particularly, to a mounting structure of a flat optical element such as a lens and a filter in the optical analyzer.

[0002]

2. Description of the Related Art Generally, a variety of optical elements such as lenses, filters, and gratings are used in various optical analyzers such as a spectrophotometer. FIG. 4 is a configuration diagram showing an example of an optical system in a general absorption spectrophotometer. Light emitted from the light source 40 containing a wide wavelength component is
1 and a rotating monochromator 42
When passing through the middle filter 42a, monochromatic light having a specific wavelength is extracted. This monochromatic light passes through the sample cell 43 filled with the sample solution and reaches the photodetector 44. By examining the difference in the intensity of the detection light between the case where the specific component is contained and the case where the specific component is not contained in the solution, the light absorptivity of the component can be obtained.

The monochromator 42 shown in FIG. 4 has a disk-shaped rotating plate 42b on which a number of filters 42a having different passing wavelengths are attached. FIG. 5 is a cross-sectional view showing a conventional mounting structure when the optical element 1 such as the filter 42a is fixed to the fixing base 2 (for example, the rotating plate 42b). In the example of FIG. 5A, a concave pedestal 26 is formed around the circular opening 20 of the fixed base 2 so that a corner of the outer peripheral end of the optical element 1 fits therein, and the adhesive 4 applied to the pedestal 26 is formed. Thus, the optical element 1 is fixed to the fixed base 2.

[0005] In the example of FIG.
Frame 27 into which the outer peripheral end face of the optical element 1 fits
Are formed to protrude. The optical element 1 is inserted into the inner periphery of the cylindrical frame 27, and the pressing plate 5 having a circular opening at the center is brought into close contact with the upper surface thereof, and the outer peripheral portion of the pressing plate 5 is fastened to the upper end of the cylindrical frame 27 with screws 6. I do. When screw 6 is tightened,
The optical element 1 is sandwiched between the holding plate 5 and the upper surface of the fixed base 2 so that there is no play.

[0005]

In the above-described spectrophotometer, when the surface of the filter 42a is damaged or the coating layer is peeled off, it is necessary to replace the filter 42a with a new one. However, in the mounting structure using the adhesive 4 as in the former, the optical element 1 once mounted cannot be removed. Therefore, there is a problem that the rotary plate 42b itself needs to be replaced only when one of the filters 42a is damaged, and the cost is increased. Further, the surface of the optical element 1 may be contaminated by the adhesive 4 when the optical element 1 is attached. Further, it takes time for the adhesive 4 to cure during the assembling operation, so that the assembling is inefficient.

On the other hand, in the mounting structure using screws 6 as in the latter, the optical element 1 can be attached and detached, but the operation is troublesome and troublesome, and the surface of the optical element 1 is damaged by a tool such as a screwdriver. There is a risk of doing so.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an optical element in which the optical element can be easily attached and detached and the optical element is less likely to be damaged during mounting. An object of the present invention is to provide an optical analyzer having a detachable structure.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an optical analyzer of the present invention comprises: a) a flat optical element; and b) a periphery of an opening smaller than one end face of the optical element. A fixed base formed by inserting a cylindrical pedestal having a height such that the other end surface of the optical element projects from the outer peripheral surface of the optical element and forming a first engaging portion on the outer peripheral surface of the pedestal; c) A cylindrical portion having an inner peripheral surface fitted on the outer periphery of the pedestal, and an end surface portion that is in contact with the outer periphery of the other end surface of the optical element protruding from the pedestal with an open center at one end surface of the cylindrical portion; An optical element mounting structure comprising: a pressing member having a second engaging portion engaged with the first engaging portion formed on the outer peripheral surface of the tubular portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the optical analyzer of the present invention, when an optical element is mounted, the optical element is inserted into a pedestal of a fixed base, and a cylindrical portion thereof is covered with a pressing member from above. Insert into the pedestal. Then, the pressing member is pushed in, and the second engaging portion of the tubular portion is engaged with the first engaging portion of the pedestal. As a result, the optical element is sandwiched between the end surface of the holding member and the fixed base. The holding member is preferably made of a rigid material having an appropriate elasticity, such as an ABS resin, for facilitating insertion into the pedestal and holding the optical element with an appropriate force. Further, the first engagement portion and the second engagement portion may be, for example, a protrusion and a recess fitted to each other, or a screw thread and a screw groove screwed to each other.

[0010]

According to the optical analyzer of the present invention, various optical elements such as a lens and a filter can be attached and detached very easily, and the optical elements are not damaged by an adhesive or a tool. In addition, since the number of components required for mounting is small and minute components such as screws and washers are not used, maintenance and management of the components can be reduced, and there is no danger that the components will be lost at the time of attaching and detaching operations.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an optical analyzer according to the present invention. FIG. 1 is a perspective view showing a mounting structure of an optical element in the optical analyzer of the present embodiment, and FIG. 2 is a sectional view taken along line A1-A2 of the mounting structure of FIG.

As shown in FIGS. 1 and 2, a cylindrical frame 21 having an inner diameter substantially the same as the outer circumference of the flat cylindrical optical element 1 is provided around a circular opening 20 of the fixed base 2. A pedestal 23 is formed on the inner peripheral side of the frame body 21, the pedestal 23 comprising a holding portion 22 which is in close contact with the outer peripheral portion of one surface (the lower surface in FIG. 2) of the optical element 1. At an appropriate position on the outer circumferential circle of the frame body 21 (in this embodiment, two positions 180 ° opposite to each other), the mounting opening 2 is provided.
The outer peripheral surface of the frame 21 inside the opening 24 has an engaging step 25 that is depressed substantially vertically toward the inner peripheral side.
The dimension from the holding portion 22 of the pedestal 23 to the upper end of the frame 21 is determined so as to be smaller than the thickness of the optical element 1. Therefore, when the optical element 1 is inserted into the inner periphery of the frame 21, the upper surface of the optical element 1 projects from the upper end of the surrounding frame 21 as shown in FIG. The fixing base 2 is made of a material having a high hardness such as a metal.

On the other hand, the holding member 3 is made of a rigid and moderately elastic material such as an ABS resin, for example, and has a cylindrical portion 31 having an inner diameter substantially equal to the outer circumference of the frame 21.
And an end surface portion 32 having a circular opening at the center, and a claw 33 projecting substantially perpendicularly to the inner peripheral side at the lower edge of the cylindrical portion 31 corresponding to the engaging step 25 on the outer periphery of the frame 21. Have been. The size of the opening 34 of the end face 32 is appropriately smaller than the outer dimension of the optical element 1, and the inner face of the end face 32 presses and holds the outer circumference of the other face (the upper face in FIG. 2) of the optical element 1. Work.

When mounting the optical element 1 on the fixed base 2, first, the outer peripheral portion of the lower surface of the optical element 1 is
The optical element 1 is inserted into the frame body 21 until the optical element 2 is hit. Then, while slightly bending the holding member 3 in the direction in which the lower end opening surface of the holding member 3 spreads from above, the holding member 3 is put on the frame 21 until the claw 33 is securely engaged with the engagement step 25. Insert. Since the pressing member 3 is an elastic body, if the height from the holding portion 22 to the lower surface of the end surface portion 32 is slightly smaller than the thickness of the optical element 1 in the engaged state, the lower surface of the end surface portion 32 becomes The upper surface of the optical element 1 is pressed with an appropriate elastic force. Therefore, the optical element 1 is stably held.

On the other hand, when removing the optical element 1, a force is applied to the pressing member 3 so that the claw 33 is engaged with the engaging step 2 of the frame 21.
5, and the holding member 3 is pulled out upward. Then, the optical element 1 is pulled out from the inside of the frame 21. When the claw 33 of the holding member 3 is detached from the engagement step 25 of the frame 21, an appropriate tool (for example, a gap between the claw 33 and the engagement step 25 from below the mounting opening 24 in FIG. It can be easily removed by inserting the tip of a driver or the like and applying a force in the outer peripheral direction.

As described above, in the mounting structure of the optical element, the optical element 1 can be attached and detached extremely easily, and the optical element 1 is securely held without rattling in the mounted state.

In the above embodiment, the holding portion 22 on the inner peripheral side of the pedestal 23 is not necessarily required to hold the entire edge of one surface of the optical element 1 as long as it can hold the outer peripheral end of the optical element 1. There is no. The same applies to the end surface portion 32 of the holding member 3. Further, the mounting opening 24 does not need to penetrate to the opposite surface side (the lower surface side in FIG. 2) of the fixed base 2,
The penetration facilitates the work at the time of removal.
Further, the unevenness of the engagement between the engagement step 25 and the claw 33 may be reversed. Furthermore, various types of optical elements 1 can be used. For example, when the optical element 1 is not a cylindrical shape such as a convex lens, the optical element 1 can be similarly handled in a state of being attached to a cylindrical adapter.

When a large number of optical elements are provided on one plate-like member as in the monochromator 42 shown in FIG. 4, the mounting structure of the above embodiment may be used for each optical element. Further, a configuration in which a common pressing member 3 is used for a plurality of optical elements can be adopted. FIG. 3 is an external perspective view showing the mounting structure of such an optical element. In this example, the holding member 3 has a plurality of cylindrical portions 31 protrudingly formed on the lower surface of a plate-like member 35 having substantially the same size as the fixed base 2 and inserted into the outer periphery of the frame 21 of the fixed base 2. Each cylindrical portion 31 has a claw 33 formed thereon. Accordingly, when each of the claws 33 is engaged with an engagement step (not shown in FIG. 4) at the lower portion of the frame body 21, the plurality of optical elements 1 are held between one fixed base 2 and the holding member 3. Is done. According to such a configuration, the number of parts can be significantly reduced.

The above embodiment is merely an example, and it is apparent that changes and modifications can be made within the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting structure of an optical element in an optical analyzer of the present invention.

FIG. 2 is a sectional view taken along line A1-A2 of the mounting structure of the optical element.

FIG. 3 is a perspective view showing a mounting structure of a plurality of optical elements.

FIG. 4 is a configuration diagram of an example of a spectrophotometer.

FIG. 5 is a sectional view showing a conventional optical element mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical element 2 ... Fixed base 20 ... Circular opening 21 ... Frame 22 ... Holding part 23 ... Pedestal 24 ... Mounting opening 25 ... Engagement step 3 ... Holding member 31 ... Cylindrical part 32 ... End face part 33 ... Claw 34 ... Opening

Claims (1)

[Claims] A) a flat optical element; and b) a height which is fitted around an opening smaller than one end face of the optical element to an outer peripheral face of the optical element and the other end face of the optical element protrudes. A fixed base having a cylindrical base formed thereon and a first engagement portion formed on an outer peripheral surface of the base; c) a cylindrical part having an inner peripheral surface fitted into the outer periphery of the pedestal; And an end surface portion which is open at the center on one end surface and abuts on the outer periphery of the other end surface of the optical element protruding from the pedestal. The second engagement portion engaging with the first engagement portion is provided on the outer peripheral surface of the cylindrical portion. An optical analyzer, comprising: a holding member formed; and an optical element mounting structure comprising: