JPH0635928U - Base plate for spectrophotometer and spectrophotometer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a base plate for a spectrophotometer and a spectrophotometer which are easy to manufacture and control products, easy to assemble, and low in cost. [Structure] The base plate 10 can be mounted with all of the light source unit 11, the spectroscope unit 12, and the detector unit 13 that compose the spectrophotometer, and is integrally molded using a predetermined resin. The spectroscope unit is a single monochromator, and includes entrance / exit slits 24a and 24b arranged at a predetermined interval, and first and second spherical mirrors 19 and 21 and a diffraction grating 20 arranged at predetermined positions. It consists of In addition, a double monochromator or a monochromator having a wide measurement range by switching a plurality of diffraction gratings can be installed in the spectroscope unit. That is,
The interval of the slits is set and fixed so that desired performance can be obtained in the monochromator to be mounted on the base plate, and the slits are commonly used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spectrophotometer base plate and a spectrophotometer.

[0002]

[Prior art]

 A spectrophotometer is generally composed of a light source unit, a spectroscope unit including a diffraction grating and a mirror, and a detector unit. Then, each part is formed by arranging various optical devices and other parts at appropriate positions. Such parts have a predetermined shape as disclosed in, for example, Japanese Patent Laid-Open No. 3-118426. It is integrated by mounting on a base plate that has mounting holes etc. at predetermined positions, and accurate alignment between each component is performed.

Since the base plate has a certain degree of rigidity and bending stress and requires high precision in dimensional accuracy such as the shape and the position of the mounting hole, aluminum die casting or a predetermined resin (glass fiber reinforced) is used. It is formed by integral molding using an unsaturated polyester resin or the like.

By the way, there are various types of configurations of the spectroscope unit, such as a single monochromator, a multiple monochromator such as a double monochromator, and a triple monochromator. Further, measurement can be performed by changing a diffraction grating used. There are various types, including those that enable measurement of the possible wavelengths from the visible side to the near infrared region. Since each of the plural types of monochromator has its own merits and demerits, the user selects and uses the most suitable device according to the characteristics of the measurement target.

[0005]

[Problems to be solved by the device]

 However, the above configuration has the following problems. That is, as described above, there are various types of spectroscopes, the number of parts to be used, of course, the arrangement position of each part, and the required occupation area and shape also differ. As a result, conventionally, a base plate corresponding to each monochromator was designed and manufactured, so that the number of base plates required was the same as that of spectrometers, and product management was complicated, and various base plates were required. The storage space for the product will be large, and the manufacturing cost per unit will be high due to the need for highly accurate manufacturing. Moreover, since the arrangement of the parts is different for each type, the assembly work is complicated.

Further, since the arrangement positions of various components in the spectroscope unit are different, the incident positions and the emission positions of the spectroscope unit are different, and accordingly, the installation positions of the light source unit and the detector unit are also different. The above problem becomes more prominent.

The present invention has been made in view of the above background, and an object thereof is a base plate and a spectrophotometer for a spectrophotometer, which is easy to manufacture, manage products, etc., is easy to assemble, and is inexpensive. To provide the total.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the base plate for a spectrophotometer according to the present invention, the base plate for mounting the components that make up the spectrophotometer, at least the part where the spectroscopic part of the spectrophotometer is mounted. In addition, the entrance slit and the exit slit can be arranged at a predetermined position in the mounting position at a predetermined interval, and the predetermined interval is set for all of the multiple types of monochromators to be mounted on this base plate. The distance required for the performance to obtain a desired value was set.

[0009]

[Action]

 Regardless of the type of spectrometer to be manufactured, a spectrophotometer can be constructed by using the same base plate and arranging parts constituting a desired spectrometer at predetermined positions on the base plate. In other words, the type of base plate to be manufactured need only be one type regardless of the type of spectroscope for which mounting is planned, and can be shared.

[0010]

【Example】

 Hereinafter, a base plate for a spectrophotometer and a spectrophotometer according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show a preferred embodiment of the present invention, in which a plurality of monochromators having different performances, more specifically, a single monochromator having a measurement wavelength of 190 to 900 nm and a double monochromator having the same wavelength are used. Monochromator and measurement We provide a base plate 10 that can be mounted with three types of monochromators, which can measure a wide range of wavelengths from 190 to 2500 nm.

Further, according to the present invention, in order to make the base plate common, in the case of a single monochromator as in the invention of the publication disclosed in the conventional example, a plane where the incident position and the emitting position on the spectroscopic unit are usually different from each other. It is placed on the top, but it is placed on the same plane as the double monochromator. The same applies to a monochromator that can measure a wide range.

Slits are arranged at the entrance position and the exit position, respectively. When the slits are arranged on the same plane as described above, the spacing is as much as possible in consideration of the resolution which is one of the performances of the spectroscope. Is shorter, but the minimum distance is determined because it is necessary to prevent various parts from being located on the optical path. In addition, the shorter the distance at which the stray light is eliminated, which is another factor of the performance of the spectrometer, is shorter. The better, or vice versa, the better, but the better the intervals.

Further, the distance from the entrance / exit slit to the spherical mirror also varies depending on the radius of curvature and size of the spherical mirror. In the past, for example, if a single monochromator composed of specified optical components has an optimal spacing of about 50 mm, then a double monochromator composed of the same optical components will have a spacing of about 120 mm. Is the optimal interval.

As described above, the conventional concept is that the distance between slits is designed according to the type of spectroscope and is different from each other, but in the present invention, such slit commonization was attempted and the same distance was used even for spectroscopes of different types. Then, the distance between the slits that can exhibit the predetermined performance is obtained, and is set to this value.

That is, as shown in FIGS. 1 to 3, the base plate 10 can mount all of the light source section 11, the spectroscope section 12, the detector section 13 and the like that constitute the spectrophotometer. It is formed by integral molding using a predetermined resin. Then, in FIG. 1, an example in which a single monochromator is mounted is shown for convenience.

That is, the light source unit 11 includes an ultraviolet lamp 14 arranged at a predetermined position, a visible lamp 15, and a rotating mirror 16 for changing the path of light emitted from each lamp. Predetermined mounting holes and screw holes are formed at the mounting positions of the components 14 to 16. Then, the light whose course is changed by the rotating mirror 16 is further converted by about 90 degrees, passes through the filter 17, and then enters the spectroscope unit 12.

The spectroscope unit 12 includes a slit device 18, a first spherical mirror 19 for making incident light parallel rays, a diffraction grating 20 for receiving parallel rays reflected by the first spherical mirror 19, It is composed of a second spherical mirror 21 for converging the light passing through the diffraction grating 20. As is well known, the diffraction grating 20 is rotatably arranged so that the wavelength of 190 nm can be measured at the position of 0 degree shown in the figure, and the wavelength of the measurement object is changed by rotating it by a predetermined angle so that it can measure up to 900 nm. It has become.

In this example, the widths of the first and second spherical mirrors 19 and 21 and the diffraction grating 20 are both about 30 mm, and the radius of curvature of each spherical mirror 19 and 21 is 500 mm. It is about degree. Therefore, the distance between the spherical mirrors 19 and 21 and the slit device 18 is about 250 mm in order to converge the incident light into a parallel light flux or to pass the light through the diffraction grating 20.

Further, as shown in FIG. 2, the slit device 18 has a plurality of predetermined widths at predetermined positions on the peripheral edge of one disk 23 rotatably mounted in a vertical plane via a rotation mechanism 22. A large number of elongated through holes 24 are formed, and the elongated through hole pairs formed at the positions facing each other in the radial direction serve as an entrance slit 24a and an exit slit 24b, respectively. The distance between the pair of the entrance slit 24a and the exit slit 24b is always constant. The resolution is determined by arranging the elongated through holes having a predetermined width at the positions of the entrance (exit) slits 24a and 24b (see FIGS. 1 and 3) by rotating the disc 23.

Further, the light emitted from the spectroscope section 12 is separated into two systems by a predetermined optical system 27 having a condensing system and a sector, and after passing the respective lights to the sample chambers 28a and 28b. , And is incident on the detector 29 for visible light in the detector unit 13.

By changing the configuration of the spectroscope section 12, it is possible to manufacture other types of spectrophotometers while using the same base plate 10. That is, as shown in FIG. 4, the spectroscope section 12 'is provided with the first to fourth spherical mirrors 30 to 33 and the first and second diffraction gratings 34 and 35, and the first and second stages are arranged. A double monochromator is formed by arranging the plane mirror 36 between the two diffraction gratings 34 and 35 which are between the two.

Further, as shown in FIG. 5, the spectroscope section 12 ″ is switched from two diffraction gratings 40 and 41 arranged in parallel to the position of the diffraction grating of the single monochromator in FIGS. 1 and 3. By disposing the diffraction grating device with a mechanism 42, a monochromator capable of measuring in a wide wavelength region is configured, that is, the diffraction grating device with a switching mechanism 42 is located at the 0 degree position shown by the solid line in the figure. A first rotation mechanism (the center of rotation is O 1) that rotates to a predetermined angle position indicated by the alternate long and short dash line and stops at an arbitrary angle during the rotation, and an ultraviolet-visible region (where the first diffraction grating 40 is located in front) ( From the measurement region in the range of 190 to 900 nm), both diffraction gratings 40 and 41 are rotated to switch to the measurement region in the near infrared region (800 to 2500 nm) in which the second diffraction grating 41 is located in front. The detector unit 13 'has a detector 29 for ultraviolet radiation and a detector 43 corresponding to the near infrared region at a predetermined position. The other configurations of the respective monochromators shown in Fig. 4 and Fig. 5 are similar to those of the single monochromator described above, and therefore, the same reference numerals are given and detailed description thereof is omitted.

Here, the first feature of the present invention is that the installation positions of the entrance and exit slits 24a and 24b constituting the spectroscope sections 12, 12 'and 12 "are fixed at predetermined intervals as described above. In other words, in the past, the distance between the slits 24a and 24b was determined with the aim of making the interval as short as possible in order to obtain the optimum setting according to the type of each monochromator, but the present invention does not Breaking the concept, the positions (intervals) were calculated so that the desired characteristics (resolution and stray light rejection) could be obtained for all monochromators to be mounted without degrading the performance, and the positions were set as slit installation positions.

Specifically, the distance between the slits is required to be at least about 90 mm from the total width of the respective elements constituting the spectroscope unit 12 ′ of the double monochromator shown in FIG. 4. In the case of a single monochromator, the minimum interval is about 30 mm, which is smaller than the above 90 mm, because the number of elements constituting the spectroscope unit 12 is small. Further, in the case of the switching type shown in FIG. 5, when rotating from the position shown by the solid line to the position shown by the alternate long and short dash line, the diffraction grating located at the rear side (the second diffraction grating 41 in the illustrated example) In order not to block the optical path, the minimum distance between the slits is about 90 mm, which does not exceed 90 mm in the double monochromator. Therefore, the minimum interval determined by the mechanical requirements is about 90 mm, and the shorter the interval, the better the resolution. Therefore, it is desirable to set the value as close as possible to 90 mm in terms of resolution.

However, it was found that stray light was generated as a result of the experiment at 90 mm, and the shortest distance between slits where stray light was not generated (good stray light removal degree) was about 100 mm. Therefore, in this example, the slit interval is fixed at 100 mm.

Although the interval set in this example is different from the optimum value in each type described above, it was confirmed as a result of the experiment that the resolution is almost the same as that in the above-mentioned interval which is said to be optimum. This is considered to be absorbed by the tolerance of each element (component) itself.

Then, the respective elements are arranged within the slit interval of 100 mm so as to be accommodated in the width direction at substantially equal intervals. Therefore, in a double monochromator with many elements, the distance between adjacent elements will be short, and conversely, a single monochromator will be wide.

As a result, the incident position of light to the spectroscope units 12, 12 ′ and 12 ″ and the emission position of light from the spectroscope units 12, 12 ′ and 12 ″ are fixed, so that the other light source units 1 1, the installation positions of the components forming the detector units 13 and 13 'are constant regardless of the type of the spectroscope unit 12, and can be shared.

On the other hand, since the arrangement of the elements in the spectroscope sections 12 and 12′12 ″ is different as described above, the portion of the base plate 10 where the spectroscope sections are arranged corresponds to the plurality of monochromators. Therefore, if a certain type of monochromator is manufactured using the actual base plate 10, unused mounting holes will occur in the spectroscope area. The hole penetrating into the hole is closed by a predetermined means.

In each of the above examples, the other type in which all of the light source section, the spectroscope section, and the detector section are mounted on the base plate has been described, but the present invention is not limited to this, and for example, the conventional example. As shown in, the base plate and the spectrophotometer (the detector is a separate structure) with the light source section and the spectroscope section installed, or conversely, the light source section has a separate structure, Furthermore, only the spectroscope unit may be used. That is, the detector section or the light source section may be separately formed.

Further, in the above-described example, the entrance and exit slits are formed by one slit device 18, but in the present invention, they may be formed separately.

[0032]

[Effect of device]

 As described above, in the spectrophotometer base plate and the spectrophotometer according to the present invention, different types of spectrophotometers can be formed using the same base plate, so that the base plate is manufactured with high accuracy and is costly. The manufacturing process can be standardized, manufacturing and product management can be done easily, and assembly work can be done easily to reduce costs.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a spectrophotometer according to the present invention.

FIG. 2 is a front view showing the slit device shown in FIG.

FIG. 3 is a schematic layout diagram of components constituting the spectrophotometer.

FIG. 4 is a diagram corresponding to FIG. 3 when a double monochromator is mounted.

FIG. 5 is a diagram corresponding to FIG. 3 when a diffraction grating switching type monochromator is mounted.

[Explanation of symbols]

 10 base plate 12, 12 ', 12 "spectroscope section 24a entrance slit 24b exit slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuto Minobe 52967 Ishikawa-cho, Hachioji, Tokyo 5 Japan Spectroscopy Co., Ltd. (72) Inventor Yoshikazu Yuki 567 2947 Ishikawa-cho, Hachioji, Tokyo Japan Spectroscopy Co., Ltd. (72) Hiroshi Hayakawa, 2967 Ishikawa-cho, Hachioji-shi, Tokyo 5 JASCO Corporation

Claims (2)

[Scope of utility model registration request] 1. A base plate for mounting components constituting a spectrophotometer, at least a portion for mounting a spectroscopic portion of the spectrophotometer is provided, and at a predetermined position of the mounting portion, a predetermined interval is provided. An entrance slit and an exit slit can be arranged, and further, such a predetermined interval is a distance required for the performance of all monochromators of a plurality of types to be mounted on this base plate to obtain a desired value. Base plate for photometer. 2. A predetermined monochromator among monochromators such as a single monochromator, a double monochromator, and a monochromator with a switching function of a plurality of diffraction gratings is mounted on the mounting portion of the base plate according to claim 1. A spectrophotometer composed of