JPH0643557U - Optical system holding device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent problems such as light flux leakage in optical systems. [Structure] A vessel 1 for housing an optical prism 91,
A cylindrical light emitting device holder 2 for accommodating the light emitting device 92;
A cylindrical light receiving device holding portion 3 for housing the light receiving device 93;
A base 5 that integrally supports these holding portions is provided. Each of the holding portions is integrally molded of black ABS resin by injection molding or the like. Further, prism holding portions 11 and 11 ′, which are inclined surfaces for holding the optical prism 91, are provided on the inner wall surface of the vessel 1 so as to face each other. [Effect] Since the surface of an optical system such as an optical prism is held by a black object, irregularly reflected light or the like is completely absorbed by the black surface, and a light flux leak phenomenon or the like does not occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical device for measuring the refractive index of a solution by optical means, and more particularly to an optical system holding device for mounting an optical system such as a prism used in the optical device. is there.

[0002]

[Prior art]

 As a conventional optical device of this type, for example, there is a device using an optical fiber as shown in FIG. 4 as a device for measuring the refractive index of a liquid. This is composed of a light emitting section 50, a light receiving section 20, an optical branching device 30, a reflecting film 70, optical fibers 40, 80, etc. Specifically, the optical fiber 40 is provided from the light emitting section 50. The optical branching device 30 is provided at the tip of the optical fiber, and the optical branching device 30 is provided with an optical fiber having a core 10 having a bent tip. Further, a reflection film 70 is provided on the tip portion of the core portion 10. Further, another optical fiber 80 is provided from the optical branching device 30, and a light receiving portion 20 is provided at the tip end portion thereof.

In such a configuration, the light beam emitted from the light emitting unit 50 propagates to the optical branching device 30 via the optical fiber 40, and then propagates to the core unit 10. In the core portion 10, the light beam undergoes total reflection according to the difference in refractive index between the core portion 10 and the measured liquid 60 in contact therewith, and a part of the light is emitted from the measured liquid body 60. While refracting to the side, the remaining part is totally reflected at the boundary surface and returns to the inside of the core portion 10. The returned light beam is reflected by the reflection film 70 provided at the tip of the core portion 10, and returns to the optical branching device 30 via the core portion 10 again. The light enters the light receiving unit 20 from here via the optical fiber 80. Then, the light receiving unit 20 detects the amount of received light. On the other hand, the amount of light totally reflected by the boundary surface is determined by the ratio between the refractive index (N _CO ) of the core portion (optical fiber) 10 and the refractive index (n) of the measured liquid 60. Therefore, the refractive index of the liquid 60 to be measured is measured by measuring the amount of total reflected light detected by the light receiving section 20.

[0004]

[Problems to be solved by the device]

 By the way, the refractometer uses an optical fiber for a detection section (sensor section) which is an optical system. That is, the sensor portion is composed of the core portion 10 made of an optical fiber, but this portion is formed of a thin optical fiber, so that there is a problem that it is easily broken. In order to solve such a problem, an optical fiber is not used for the detecting section, and a prism which is stable in terms of strength is used. However, the prism used in such a conventional optical device has a problem such as leakage of a light beam due to irregular reflection. The purpose (problem) of the present proposal is to provide an optical system holding device that solves these problems.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has taken the following measures. That is, in a holding device for an optical system including a prism, a planar shape is a quadrangular shape, and a vessel having prism holding portions made of inclined surfaces on opposite inner wall surface sides, and a base holding the vessel. A light emitting device holding portion having an opening on one side of the inclined surface that is held by the base and forms the prism holding portion; And a light receiving device holding part having an opening on the other side of the light receiving device holding part, and at least the inner surface of the vessel, the inner surface of the light emitting device holding part, and the inner surface of the light receiving device holding part. We decided to use a black member that does not transmit or reflect light.

[0006]

[Action]

 By adopting the above configuration, the present invention has the following effects. That is, in FIG. 2, the optical prism 91 is installed in the vessel 1, the light emitting device 92 is installed in the light emitting device holder 2, and the light receiving device 93 is installed in the light receiving device holder 3. In such a state, the liquid to be measured 95 is dropped on the upper surface (total reflection surface) of the optical prism 91, and the light beam is emitted from the light emitting device 92. The light beam enters the optical prism 91 as a light beam having a constant solid angle, and advances to the total reflection surface in contact with the measured liquid 95. A part of the incident light flux is refracted on the total reflection surface and travels toward the liquid under measurement 95 side, and the remaining part is totally reflected and travels toward the light receiving device 93 side as indicated by a dashed line arrow. The light receiving device 93 detects and measures the amount of this totally reflected light flux.

In such an operating state, in the present invention, as shown in FIG. 2, in the light beam (light flux) emitted from the light emitting device 92, only the light beam traveling as shown by the one-dot chain line arrow reaches the light receiving device 93. However, the light flux traveling in the other direction does not reach the light receiving device 93. That is, the light beam emitted from the light emitting device 92 is diffusely reflected on various surfaces of the optical prism 91, but the inner surface of the vessel 1 in which the optical prism 91 is housed is not limited to the prism holder 11. Since the surface is made of a black member that neither reflects nor transmits light at all, all light fluxes other than those indicated by the one-dot chain line arrow in FIG. 2 are absorbed by the inner surface of the vessel 1. . Therefore, it becomes possible to avoid the leakage phenomenon of the light flux, which has been a problem in the conventional optical system, and thus it becomes possible to obtain highly accurate measurement data.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the structure of this embodiment includes a vessel 1 in which an optical prism 91 is housed, a light emitting device holder 2 in which a light emitting device 92 including a light emitting diode is housed, and a photo sensor and the like. The light receiving device holding section 3 for accommodating the light receiving device 93 and the base 5 for integrally holding the vessel 1, the light emitting device holding section 2, and the light receiving apparatus holding section 3 are basically formed.

In such a basic configuration, each of the above members is made of black ABS resin and is integrally molded by injection molding or the like. The vessel 1 in which the optical prism 91 is housed has a quadrangular shape in plan view, and prism holding portions 11 and 11 ′ having inclined surfaces are provided on the inner wall surfaces facing each other. It has been configured. Then, the light emitting device holding part 2 for accommodating the light emitting device 92 is provided on one side of the prism holding parts 11 and 11 'composed of these inclined surfaces, and the light receiving device 93 is accommodated on the other side. The light receiving device holding portion 3 is provided. Further, the opening of the light emitting device holding portion 2 is provided on the inclined surface of the light emitting device holding portion 2 side, and the opening portion of the light receiving device holding portion 3 is provided on the other inclined surface. ing. As a result, the light flux emitted from the light emitting device 92 is illuminated onto the incident surface of the optical prism 91 through the opening on the light emitting device holding portion 2 side, and the light flux incident on the optical prism 91 is , Is totally reflected by the total reflection surface of the optical prism 91, further proceeds from the emission surface of the optical prism 91 to the light receiving device 93 side through the opening on the light receiving device holding portion 3 side, It is measured by the light receiving device 93.

In the optical system holding device having such a configuration, as shown in FIG. 3, an optical prism 91 is installed in the vessel 1, a light emitting device 92 is installed in the light emitting device holding portion 2, and further, A light receiving device 93 is installed in the light receiving device holder 3. The optical system holding device in which each optical system is installed as described above is mounted in the housing 99 with screws or the like, and other functional components are mounted on the substrate 98, so that the prism type refractometer, etc. An optical device will be formed.

Next, the operation of this embodiment having the above configuration will be described. First, in FIG. 2, the measured liquid 95 is dropped on the upper surface (total reflection surface) of the optical prism 91 installed in the vessel 1. Then, a light beam (luminous flux) is emitted from the light emitting device 92 installed in the light emitting device holder 2. The light beam (light flux) is incident on the optical prism 91 as a light flux having a constant solid angle, and advances to the total reflection surface that is in contact with the measured liquid 95. A part of the incident light flux is refracted at the total reflection surface and enters the liquid to be measured 95 side, and the other remaining part is totally reflected and proceeds to the light receiving device 93 side as shown by the one-dot chain line arrow. The amount of the totally reflected light flux is detected by the light receiving device 93 and measured.

In such an operating state, in the present embodiment, as shown in FIG. 2, the light beam (light flux) emitted from the light emitting device 92 is received by the light flux which progresses as shown by the one-dot chain line arrow. It will be measured by the device 93. That is, the luminous flux emitted from the light emitting device 92 is diffusely reflected by the inner surface of the light emitting device holding portion 2 or various surfaces of the optical prism 91, but the inner surface of the vessel 1 in which the optical prism 91 is housed is , All the surfaces including the prism holders 11 and 11 ′ and the bottom surface 12 are made of a black member, and the inner surfaces of the light emitting device holding unit 2 and the light receiving device holding unit 3 are also made of a black member, so that the irregular reflection is caused. All the light is absorbed on the surface of the black member. Therefore, neither reflected light nor transmitted light is emitted from the surface. As a result, of the luminous flux emitted from the light emitting device 92, only the light flux traveling as shown by the one-dot chain line arrow in FIG. 2 is detected and measured by the light receiving device 93. From the above, in the present embodiment, the problems such as the leakage of the luminous flux, which have been a concern in the conventional art, are solved, and thereby, the highly accurate measurement result can be obtained.

[0013]

[Effect of device]

 According to the present invention, in a holding device of an optical system including a prism, a planar shape is a quadrangle, and a vessel having a prism holding portion having an inclined surface on the inner wall surface side facing each other and a vessel holding the vessel. And a light emitting device holder having an opening on either side of the inclined surface that is held by the base and that forms the prism holder, and the inclined surface that is held by the base. Of these, at least the inner surface of the vessel, the inner surface of the light-emitting device holding portion and the inner surface of the light-receiving device holding portion have a light receiving device holding portion having an opening on the other side. Since the configuration is made of a black member that does not transmit or reflect light, the inner surface of the light emitting device holding part, the inner surface of the light receiving device holding part, the inner surface of the vessel, etc. All of the light flux coming leaked Mai to absorb at the inner surface (surface) reflection was also become possible to make not even perform transmission. As a result, problems such as leakage of light flux in the optical system can be solved, and highly accurate measurement results can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of an optical system holding device according to the present invention.

FIG. 2 is an explanatory view showing an operation mode of the optical system holding device according to the present invention.

FIG. 3 is an exploded perspective view showing an overall configuration of an optical device using the optical system holding device according to the present invention.

FIG. 4 is an external view showing an overall configuration of an optical device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vessel 11 Prism holding part 11 'Prism holding part 12 Bottom face 2 Light emitting device holding part 3 Light receiving device holding part 5 Base 91 Optical prism 92 Light emitting device 93 Light receiving device 95 Liquid to be measured 98 Substrate 99 Housing

Claims (1)

[Scope of utility model registration request] 1. A vessel having a quadrangular planar shape and having prism holding portions each having an inclined surface on an inner wall surface side facing each other, a base holding the vessel, and a prism held by the base and the prism. A light emitting device holding part having an opening on one side of an inclined surface forming the holding part, and a light receiving device holding part having an opening on the other side of the inclined surface while being held by the base. And at least the inner surface of the vessel, the inner surface of the light-emitting device holding portion, and the inner surface of the light-receiving device holding portion are made of black that does not transmit or reflect light. An optical system holding device.