JPH05188315A - Optical applied apparatus - Google Patents

Abstract

PURPOSE:To obtain the optical applied apparatus which can be satisfactorily used even in an atmosphere in which an ambient temperature is high by containing the optical applied apparatus main body in an internal space of a housing in which a filter is provided in a front opening part, and a cooling part is attached to a back opening part. CONSTITUTION:In a housing 1 for containing an apparatus main body 2, a filter 3 transmitting only wavelength of a laser light but not the wavelength of a heat ray, etc., is provided in a front opening part 1B, a cooler 4 is attached to a back opening part 1C, and other wall side of the housing 1 is made to be a double structure and forms an air layer. Accordingly, even if an ambient temperature of the outside of the housing is high, an internal temperature can be held at a prescribed temperature or below, a laser diode of the apparatus body 2 is not broken down and normal use of the apparatus 2 can be continued. Also, the apparatus main body 2 can be taken in and out easily by detaching the cooler 4 of the back opening part 1C of the housing 1, and moreover, the laser light which is made incident and emitted from the contained apparatus main body 2 can transmit freely through the filter 3, therefore, this apparatus can be used even in the environment in which an ambient temperature in the outside of the housing is high.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical application device used in a high temperature environment.

[0002]

2. Description of the Related Art In an optical application device having a light projecting portion and a light receiving portion (for example, a bar code reader), a laser diode is used for the light projecting portion and a photodiode is used for the light receiving portion.
In this case, in particular, the laser diode is vulnerable to heat, so that a heat sink is provided in contact with the laser diode, and the heat generated in the laser diode is dissipated by this heat sink.

[0003]

However, when such a conventional optical device is used in an atmosphere with a high ambient temperature, it is not enough to dissipate the heat by the heat sink.
The laser diode housed inside the optical application device is destroyed by the influence of high temperature in the surroundings. Therefore, there is a problem that the optical application device cannot be used in a high temperature environment.

The object of the present invention is to solve the above-mentioned problems.
An object is to provide an optical application device that can be sufficiently used even in an atmosphere with a high ambient temperature.

[0005]

According to the first aspect of the present invention, there is provided an optical applied device main body in an internal space of a housing having a filter in a front opening and a cooler attached to a rear opening. Stored. In this case, the wall surfaces other than the front surface side and the back surface side of the housing have a double structure, and an air layer is formed between these wall surfaces. Further, in such a configuration, the filter has a characteristic of transmitting only the wavelength of the laser light and not transmitting the heat rays and other wavelengths, and the cooler is composed of an electronic cooling element and a cooling fan for cooling the same. Alternatively, a fluid cooling system in which a fluid is circulated and cooled is used.

In the optical-applied device according to the second aspect of the present invention, the optical-applied device main body case is covered with a cover so as to cover the entire side surface of the case, and the cover and the side surface of the main body case. A cooling gas or a cooling liquid was introduced into the space, and a filter for transmitting only the wavelength of laser light was attached to the front of the opening of the main body case or cover. Further, in the configuration, the cover is provided with the inlet and the outlet so that the distance between them is as large as possible.

[0007]

According to the first configuration of the present invention, the main body of the optical application device is sufficiently cooled by the cooler inside the housing, and the wall surface of the housing has a double structure so that an air layer is formed between these wall surfaces. Due to the heat insulation effect, even if the optical equipment is used in an atmosphere with a high ambient temperature, the laser diode, which is weak against heat, is not destroyed and can be used for a long time. Further, since the filter attached to the front opening has a characteristic of transmitting only the wavelength of the laser light and not transmitting the heat ray and other wavelengths, the heat ray from the outside does not enter the inside of the housing from the filter, Also, the laser light emitted from the main body of the optical application device passes through the filter and goes out of the housing, and the reflected laser light from the object to be detected also passes through the filter and enters the optical application device. Even if the device body is inside the housing, there is no hindrance to the detection of the detected object.

Further, according to the second aspect of the present invention, the optical application device is sufficiently cooled as described above by circulating the cooling gas or the cooling liquid in the space between the cover and the side surface of the main body case. Even if the optical application device is used in an atmosphere with a high ambient temperature, the laser diode, which is weak against heat, is not destroyed and can be used for a long period of time.
Moreover, since the filter attached to the front face of the opening of the main body case or cover has a property of transmitting only the wavelength of the laser light and blocking the heat rays and other wavelengths, external heat rays penetrate the inside of the main body from the filter. The laser light is emitted from the optical application device to the outside, and the detection of the object to be detected is performed without any trouble.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of an optical application apparatus according to an embodiment of the present invention, FIG. 2 is a front view taken along the arrow P of FIG. 1, and FIG. 3 is a rear view taken along the arrow Q of FIG. In the figure, an opening 1B having a spigot portion 1A is provided on the front side of the housing 1, an opening 1C having a size allowing the optical application device body 2 to be freely taken in and out is provided on the back side, and other wall surfaces are An air layer 1D is formed between these wall surfaces as a double structure. Further, a mounting base 1E for mounting the optical application device body 2 is provided on the inner bottom surface of the housing 1. The filter 3 has a characteristic of transmitting only the wavelength of the laser light and not transmitting heat rays and other wavelengths, and is fixed in close contact with the spigot portion 1A of the front opening 1B of the housing 1. The cooler 4 includes an electronic cooling element 4A having a Peltier effect and a cooling fan 4B for cooling the electronic cooling element 4A. The electronic cooling element 4A is fixed to the rear opening 1C by a mounting screw 5 in a state of entering the inside of the housing 1. ing.

FIG. 4 is a cross-sectional view of an optical application apparatus which is a different embodiment of the present invention, FIG. 5 is a front view taken along arrow R of FIG. 4, and FIG. 6 is a rear view taken along arrow S of FIG. Those denoted by the same reference numerals as 3 are the same parts. This embodiment differs from the above-mentioned embodiments in the structure of the cooler attached to the rear opening 1C of the housing 1. That is, the cooler 14 is a fluid cooling system, which injects a cooling liquid or a cooling gas from the fluid injection port 14A to circulate the flow passage 14C, cools the internal space of the housing 1 in the process of circulation, and discharges the fluid. The structure is such that it is discharged from the outlet 14B. The other parts, structure, action, etc. of this optical application device are exactly the same as those of the optical application device of the above-mentioned embodiment, and therefore their explanation is omitted.

FIG. 7 is a sectional view of an optical application apparatus according to a third embodiment of the present invention, FIG. 8 is a front view as seen from the arrow T of FIG. 7, and FIG. 9 is a rear view as seen from the arrow U of FIG. The same parts as those shown in FIG. 6 are designated by the same reference numerals. In this embodiment, a cover 6 is covered on the side surface of the case of the optical application device body 2 so as to cover the entire side surface of the case, and an air layer 1D is formed between the side surface of the case of the body 2 and the cover 6. Further, the front opening 2A of the main body 2 is made to coincide with the front opening 6A of the cover 6, and the filter 3 (of the same quality as the filter of the above-described embodiment) is attached to the front opening 6A. A connector 9 is provided on the wall surface of the rear surface 2B of the main body 2 as a relay point between the external cable 10 and a lead-out line from a light emitting portion and a light receiving portion (not shown) inside the optical application equipment main body 2. Further, the cover 6 has an inlet 7 and an air layer 1D into which gas or liquid flows from the outside.
The extraction ports 8 that flow out from each are provided so as to be diagonal to each other. When an optical application device is used, a cooling gas or a cooling liquid is introduced to the air layer 1D from the outside through the inlet 7, and the side surface of the case of the optical application device body 2 is cooled by the cooling gas or the cooling liquid. Prevents high temperature inside the light-emitting and light-receiving parts (not shown). The cooling gas or the cooling liquid in the air layer 1D is circulated by flowing out from the extraction port 8.

[0012]

According to the first aspect of the present invention, the housing for accommodating the main body of the optical application equipment is provided with a filter for transmitting only the wavelength of the laser light and not transmitting the heat rays and other wavelengths in the front opening thereof, and the rear surface thereof. Since a cooler is attached to the opening and the other wall surface of the housing has a double structure to form an air layer between these wall surfaces, the ambient temperature outside the housing is high, for example, 70 to 80 ° C. Even in an atmosphere of 40
It can be kept below ℃, and the optical application equipment can be used normally without destroying the laser diode of the optical application equipment main body stored in the housing. In addition, the main body of optical application equipment can be easily put in and out by removing the cooler at the rear opening of the housing, and the laser light entering and exiting the main body of the optical application equipment can be freely transmitted through the filter. It can be used even in an environment where the ambient temperature is high.

According to the second aspect of the present invention, the main body of the optical application device is directly cooled by the cooling gas or the cooling liquid flowing in the air layer between the side surface of the optical application device main body and the cover. Similar to the case of the first configuration described above, it can be used even in an environment where the ambient temperature outside the housing is high.
Moreover, in this case, since the case of the first configuration is not required, the entire size is remarkably reduced. Further, in the case of this configuration, since only one filter needs to be installed in front of the opening of the main body case or the cover, it is possible to avoid a decrease in performance such as a decrease in light output or a decrease in the amount of light incident on the light receiving part. It

[Brief description of drawings]

FIG. 1 is a side sectional view of an optical applied device according to a first embodiment of the present invention.

FIG. 2 is a front view taken along the arrow P of FIG.

FIG. 3 is a rear view taken along the arrow Q in FIG.

FIG. 4 is a side sectional view of an optical device according to a second embodiment of the present invention.

FIG. 5 is a rear view as seen from the arrow R in FIG.

FIG. 6 is a rear view taken along the arrow S in FIG.

FIG. 7 is a side sectional view of an optical application device according to a third embodiment of the present invention.

FIG. 8 is a front view seen from the arrow T of FIG.

9 is a rear view of FIG. 7 viewed from the direction of arrow U.

[Explanation of symbols]

 1 Case 1A Inlay part 1B Front opening 1C Rear opening 1D Air layer 2 Optical application equipment body 3 Filter 4 Cooler 4A Electronic cooling element 4B Cooling fan 6 Cover 6A Cover opening front 6B Cover opening Rear 7 Filling port 8 Extraction port 14 Cooler

Claims (7)

[Claims] 1. An optical application device, characterized in that the optical application device main body is housed in an internal space of a housing provided with a filter in a front opening part and a cooler attached in a rear opening part. 2. The optical application device according to claim 1, wherein the wall surfaces other than the front side and the back side of the housing have a double structure. 3. The optical application apparatus according to claim 1 or 2, wherein the filter has a characteristic of transmitting only the wavelength of the laser beam and not transmitting the heat ray and other wavelengths. 4. An optical application device according to claim 1, 2 or 3, wherein the cooler comprises an electronic cooling element and a cooling fan for cooling the electronic cooling element. 5. An optical application apparatus according to claim 1, 2 or 3, wherein the cooler is of a fluid cooling type in which a fluid is circulated for cooling. 6. A cover is provided on the side surface of the main body of the optical application equipment so as to cover the entire side surface of the case with a space therebetween, and a cooling gas or a cooling liquid flows into the space between the cover and the side surface of the main body case. Along with the main case or cover, an optical application device is equipped with a filter that transmits only the wavelength of the laser light in front of the opening. 7. The optical application device according to claim 6, wherein the cover is provided with an inlet and an outlet so that the distance between them is as large as possible.