JPH0446167Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention combines a one-dimensional image sensor, etc., which has a plurality of light-receiving elements arranged one-dimensionally at high density to the same size as the object to be measured. The invention relates to a slit-type spectrometer used in

[Conventional technology]

Conventionally, slit-type spectrometers that are used in combination with a 1-magnification image sensor have already been proposed in Japanese Patent Application No. 61-38785 and Utility Application No. 167230-1983 by the inventors of the present invention. For example, as shown in FIG. 2, a life-size image sensor 1 has an appropriate number of light-receiving elements 13 placed on the light exit side of a slit B formed by a plurality of partition walls 11.
2 is provided so as to be orthogonal to the slit B at an appropriate interval, and the incident light passes through the slit B formed by the partition wall 11 as an optical path, and the lower end of the slit is used as a light exit to produce a life-sized image. The light was received by a plurality of light receiving elements 13 on the sensor 12.

[Problem to be solved by the invention] However, in the case of slit-type spectrometers used in combination with these 1-magnification image sensors, it is difficult to detect a slit-type spectrometer among the multiple photodetectors that make up the 1-magnification image sensor. When there is a light-receiving element placed directly under the slit, there is a disadvantage that the video signal level decreases as shown in the video signal level in FIG. 2 due to the influence of the shadow of the partition wall forming the slit. This effect is particularly large when adjacent slits are shielded from light by the edges of the plate, causing a signal level drop similar to that caused by shielding bits, resulting in a problem of error.

Therefore, the present invention was devised in view of these drawbacks, and the object is to provide a slit-type spectrometer that eliminates the shadow caused by the partition wall forming the slit and does not reduce the video signal level. be.

[Means for solving problems]

The slit-type spectrometer of the present invention has partition walls forming a plurality of slits having a light entrance and a light exit, which are equally spaced from each other, and a partition wall that is perpendicular to the lower end side of each partition on the light exit side of the slit. a light diffusing plate provided on the bottom of the light diffusing plate on the lower end side of the partition;
It is provided in parallel with the light diffusing plate and includes an image sensor having a plurality of light receiving elements mounted thereon.

[Function] The present invention provides a light diffusing plate made of frost material on the light exit side of the slit formed by each partition wall, on the lower end side of each partition wall, parallel to the image sensor, thereby allowing an appropriate amount of light to enter. A slit-type spectrometer that can diffuse light, allow all light-receiving elements that make up the image sensor to receive uniform light without the influence of shadows caused by slit partition walls, and do not cause a drop in video signal level. can be formed.

〔Example〕

This invention will be explained below based on the drawings. In Fig. 1, reference numeral 1 denotes a partition wall made of a glossy, non-reflective, opaque sheet material of 0.1 mm or less. The partition walls 1 are arranged at equal intervals from each other.
A slit A is formed by this. Reference numeral 2 denotes a 1-size image sensor disposed on the light exit side of the slit A so as to be perpendicular to the partition wall/slit at an appropriate interval, and 3 an appropriate number of image sensors placed on the 1-size image sensor. 4 indicates the video signal level output from each light receiving element. 5 is frost film,
A light diffusing plate made of a frosted material such as frosted glass is provided on the light exit side of the slit A formed by the plurality of partitions 1, in close contact with the lower end of each partition 1, and parallel to the same-magnification image sensor 2. It is being

Now, when light enters from the light entrance of the slit A formed by each partition 1, it passes through the light diffusing plate 5 made of a frost material such as a frost film or frost glass via an optical path formed by the slit.
The light passing through the light diffusion plate 5 is uniformly diffused in an appropriate amount and is received by the plurality of light receiving elements 3 placed on the image sensor 2, so that the signal level does not decrease and the desired signal level is maintained. was completed.

[Effect of idea]

The present invention includes a partition wall forming a plurality of slits that are equally spaced from each other and have a light entrance and a light exit;
A slit-type spectroscope consisting of a light diffusing plate provided perpendicularly to the lower end side of each partition wall on the light exit side of the slit, and a single-magnification type spectrometer having a plurality of light-receiving elements arranged one-dimensionally at high density. By using an image sensor in combination, it is possible to diffuse the appropriate amount of incoming light, allowing all light-receiving elements of the image sensor to receive even light without the influence of shadows caused by slits or partition walls. In addition, the shadows of the slits and partition walls are compensated for by the light passing through each slit, and even if the adjacent slit on one side is blocked, the level of the light-receiving element directly under the partition wall will not drop below the threshold, which has the effect of stabilizing the signal level. There is.

[Brief explanation of the drawing]

FIG. 1 is a schematic illustration of an embodiment of the slit-type spectrometer of the present invention, and FIG. 2 is a schematic illustration of a conventional example of the slit-type spectrometer. 1, 11... Partition wall, 2, 12... Image sensor, 3, 13... Light receiving element for image sensor, 4, 14... Video signal level of light receiving element,
5...Light diffusion plate, A, B...Slit.

Claims (1)

[Scope of utility model registration request] Partition walls forming a plurality of slits having a light entrance and a light exit, which are equally spaced from each other, and a light diffusing plate provided perpendicularly to the lower end side of each partition on the light exit side of the slits. A slit-type spectrometer.