JPS62284220A - Optical sensor - Google Patents

Abstract

PURPOSE:To eliminate the need for extra signal processing for the removal of a self-diagnosing function by forming a cut surface which receives and reflects self-diagnosing light so that a detector detects it at the peripheral edge part of one optional lens of an optical system. CONSTITUTION:The cut surface A with a 45 deg. tilt angle is formed by cutting inside the outer peripheral edge part end surface of the optical flat lens 3 and this cut surface is a desired reflecting surface obtained by specular surface processing. A light source chamber 7 is projected from the outer peripheral surface of a lens barrel 1 right above the formation position of the cut surface A. The reflection angle of the cut surface A to the self-diagnosing light 1 is 90 deg., so the self-diagnosing light 11 is reflected by the cut surface A at right angles and incident on a combined lens 4 in parallel to an optical axis 12. Then, the light is incident on the optical axis position of a light receiving part 21 through combined lenses 5 and 6. Consequently, conventional extra signal processing is not necessary because no halfmirror is provided on the lens surface of the optical system.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an optical sensor having a function of self-diagnosing the operation quality of an optical system and a detector.

(Prior Art) Conventionally, as an optical sensor equipped with a self-diagnosis function, one shown in FIG. 2, for example, is known.

In FIG. 2, reference numeral 1 denotes a lens barrel, and a detector 2 is disposed deep inside the lens barrel 1, and an optical flat lens 3, a set of lenses 4,
Various lenses constituting the optical system are arranged in the order of numbers 5 and 6. Detector 2 is a two-dimensional CCD (Charge
(Coupled Device) Consists of a light receiving section 21 equipped with an image sensor and a signal processing section 22. Further, a light source chamber 7 is provided protruding from a predetermined portion of the outer periphery on the opening side of the lens barrel 1, and this light source chamber 7 includes a light source 8 such as a light emitting diode or a lamp, and a pinhole plate 9. , a convex lens 10 is provided.The convex lens 10 collimates the light from the light source 8 that enters through the pinhole of the pinhole plate 9, and converts the light into self-diagnosis light 11 along the outer surface of the optical flat lens 3. The light is emitted in a direction perpendicular to the axis 12. and,
A half prism 13 is attached to the optical axis position of the outer surface of the optical flat lens 3, and the self-diagnosis light 11 is reflected in the right angle direction by this half prism 13, and is detected by the detector 2 via the optical system. Ru.

In short, in this optical sensor, the light receiving section 21 of the detector 2
In this case, if the detection position of the self-diagnosis light 11 deviates from the optical axis position, it may be due to various lenses in the optical system! It is possible to diagnose that a shift has occurred or that the detector 2 has moved and the light receiving surface of the light receiving section 21 has tilted.

(Problems to be Solved by the Invention) However, in such a conventional optical sensor, since the half prism 13 is provided at the optical axis value 1 of the optical flat lens 3, there are various problems as follows. .

First, in normal use, extra signal processing is required to remove the influence of the half prism 13.

In addition, when this type of optical sensor is mounted on a satellite, in order to meet the vibration resistance requirements, a half prism 1
It becomes necessary to increase the thickness of the optical flat lens 3 by a small amount of 3, which increases the weight of the optical sensor. On the other hand, regarding the requirement for heat resistance, it is difficult to obtain an adhesive suitable for pasting the half prism 13. Since the adhesive changes over time, it is assumed that this will cause a shift in the attachment position of the half prism 13, making it difficult to maintain a constant self-diagnosis function stably.

The present invention was developed in view of these conventional problems, and its purpose is to easily meet the requirements for vibration resistance and heat resistance, and to eliminate unnecessary signal processing to eliminate the influence of self-diagnosis functions. The objective is to provide an optical sensor that does not require

(Means for Solving the Problems) In order to achieve the above object, the optical sensor of the present invention has the following configuration.

That is, in the optical sensor of the present invention, a detector for receiving light incident from the outside via the optical system is disposed deep inside a lens barrel that houses an optical system consisting of a combination of a plurality of lenses, and In an optical sensor in which a light source that emits self-diagnosis light in a direction intersecting the optical axis of the optical system is disposed at a predetermined part on the outer periphery of the lens barrel; a peripheral edge of any one lens of the optical system; Preferably, a cutting surface is formed to receive the self-diagnosis light and reflect it so that the detector receives the self-diagnosis light.

(Function) Next, the function of the optical sensor of the present invention configured as described above will be explained.

The self-diagnosis light is reflected by a cut surface formed by cutting an end face of any one lens of the optical system, and is received by a detector via the optical system.

Therefore, a self-diagnosis function equivalent to that of a conventional optical sensor can be obtained.

As described above, according to the optical sensor of the present invention, no half prism is provided on the lens surface of the optical system, so that extra signal processing as in the conventional method is not required.

Furthermore, since the reflective surface is formed by cutting at the peripheral edge of the lens, it is easy to meet the requirements for vibration resistance and heat resistance. Furthermore, since the number of parts is reduced compared to the conventional system, reliability is further improved, and the excellent effect of stably maintaining a certain level of self-diagnosis function over a long period of time can be obtained.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
The figure shows an optical sensor according to an embodiment of the present invention. Components that are the same as those of the conventional device are given the same names and symbols, and their explanations will be omitted.

In this embodiment, the optical flat lens 3
A cut surface A having an inclination angle of 45° is cut on the inner side of the end face of the outer peripheral edge, and this cut surface becomes a desired reflective surface by mirror finishing. Therefore, the light source chamber 7 is provided in a protruding manner on the outer peripheral surface of the lens barrel 1 directly above the formation position of the cutting surface A.

In the illustrated example, since the reflection angle of the self-diagnosis light 11 on the cutting surface A is 90°, the self-diagnosis light 11 is reflected in the right angle direction on the cutting surface A and enters the lens assembly 4 in parallel to the optical axis 12. , and then enters the optical axis position of the light receiving section 21 via the assembled lenses 5 and 6.

Note that the incident position of the self-diagnosis light 11 on the light receiving part 21 does not need to be at the optical axis position, so the inclination angle of the cutting surface A is 45°.
Any angle can be selected.

In addition, in this embodiment, the lens forming the cut surface A was formed on the outermost optical flat lens 3 in consideration of ease of manufacture, but it may also be formed on the inner set of lenses 4, 5, etc. .

(Effects of the Invention) As detailed above, according to the optical sensor of the present invention, since no half prism is provided on the lens surface of the optical system,
There is no need for extra signal processing as in the past. Furthermore, since the reflective surface is formed by cutting at the peripheral edge of the lens, it is easy to meet the requirements for vibration resistance and heat resistance. moreover,
Since the number of parts is reduced compared to the conventional type, reliability is further improved, and the excellent effect of being able to stably maintain a certain level of self-diagnosis function over a long period of time can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an optical sensor according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional device. 1... Lens barrel, 2... Detector, 3.
...Optical flat lens, 4,5.6
....lens set, 8..light source, 9.
...Pinhole plate, 10...Convex lens,
11... Self-diagnosis light, 12... Optical axis, A... Cutting surface. Agent Patent Attorney Yoshi Hachiman

Claims (1)

[Claims] A detector that receives light incident from the outside through the optical system is disposed deep inside the lens barrel that houses an optical system consisting of a combination of multiple lenses, and a detector is installed at a predetermined location around the outside of the lens barrel. In an optical sensor including a light source that emits self-diagnosis light in a direction intersecting the optical axis of the optical system; a peripheral end of any one lens of the optical system receives the self-diagnosis light; An optical sensor characterized in that a cut surface is formed to reflect the light so that the detector receives the light.