JPH11283437A - Heat insulating device for optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent heat emitted by light sources from being transferred to thermophobic parts by providing a heat insulating partition wall consisting of at least double partition walls forming a cooling heat insulating passage, between the light sources and the thermophobic parts. SOLUTION: A first partition wall 74 if provided in such a manner as to isolate a projecting lamp 32, an illuminating lamp 64, and a CCD camera 52 from one another, and a second partition wall 76 is provided on the side of the lamps 32, 64 to form a cooling passage 102 through which the heat emitted by the lamps 32, 64 is guided to a cooling fan 70. Heat insulation between the lamps 32, 64 and the CCD camera 52 is thereby achieved and the temperature of the first partition wall 74 is prevented from rising. Further, a cooling fan 72 and a third partition wall 78 are provided on the side of the first partition wall 74 facing the CCD camera 52, to form an exhaust heat insulating passage 104. Thereby the transfer of the heat to the CCD camera 52 via the first partition wall 74 is effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device in which a light source and a heat-dissipating part are housed in a common housing, and for heat insulation for preventing heat generated by the light source from being transmitted to the heat-dissipating part. The present invention relates to a heat insulating device having a partition.

[0002]

2. Description of the Related Art In an optical device having a light source such as a lamp, the light source acts as a heat source and exerts heat on the surroundings. Is housed in the same housing as the light source, it is necessary to provide a heat insulating structure for preventing the heat generated by the light source from being transmitted to the heat-dissipating portion. For this reason, conventionally, a device has been devised in which an exhaust fan is provided on the outer wall of the housing to discharge the air heated by the light source to the outside.

[0003]

However, there is a problem that a sufficient heat insulating effect cannot be obtained by merely providing an exhaust fan as in the prior art. For example, in a lattice projection type moiré device configured to capture not only the three-dimensional shape information of the measured object but also the pattern information, a configuration is adopted in which the measured object is illuminated with an illumination lamp when the pattern information is captured. If adopted, replace the lighting lamp with CC
In many cases, it must be arranged relatively close to an imaging unit such as a D-camera. In such a case, simply providing an exhaust fan transfers the heat generated by the illumination lamp to the imaging unit. It is difficult to sufficiently prevent Such a problem is a problem that can occur in other optical devices as well.

On the other hand, a first partition is provided for isolating the light source from the heat-dissipating portion, and a second partition is provided on the light source side of the partition, and a cooling passage for guiding heat generated by the light source to the exhaust fan by the two partitions. Is formed, the ventilation efficiency in the compartment on the light source side partitioned by the first partition can be increased. Thus, the temperature rise of the first partition can be suppressed, and the heat can be prevented from being transmitted to the heat-insulating section through the partition to some extent. However, in the case where the heat-dissipating portion extremely dislikes heat, such as a CCD camera, it is required to more effectively prevent heat transfer to the heat-dissipating portion.

The present invention has been made in view of such circumstances, and in an optical device in which a light source and a heat-repelling part are housed in a common housing, heat generated by the light source is transmitted to the heat-reducing part. It is an object of the present invention to provide a heat insulating device that can effectively prevent the occurrence of the heat.

[0006]

According to the heat insulating device of the optical device of the present invention, a light source and a heat-reducing part are housed in a common housing, and a heat-insulating partition is arranged between the light source and the heat-reducing part. In the heat insulating device in the optical device, wherein the heat generated by the light source is prevented from being transmitted to the heat dissipating portion, the heat insulating partition is constituted by at least a double partition forming a cooling heat insulating path. It is characterized by becoming.

Here, the "light source" is not limited to a specific type of light source as long as it is a heat radiation type light source that may adversely affect the heat-reducing part. In addition, the above-mentioned “anti-heat part” is not limited to a specific element as long as it may be adversely affected by the heat generated by the light source. For example, a light-receiving body, an electric circuit, a control circuit, a precision machine Etc. correspond to this. Further, it is preferable that the cooling heat insulating path is provided with an external air intake port and an exhaust device for forcibly passing outside air into the heat insulating path.

[0008] Further, the heat-dissipating portion is formed of a photoreceptor, and at least one of the partition walls forming the cooling adiabatic path is configured as a light-shielding wall for preventing light from the light source from entering the photoreceptor. Is preferred. Further, the optical device comprises a lattice projection type moiré device that captures three-dimensional shape information and pattern information of the measured object, and the light source emits light from the illumination lamp that irradiates the measured object when capturing the pattern information. In this case, the photoreceptor can be configured to include an imaging unit.

[0009]

As described above, the heat insulating device in the optical device according to the present invention is arranged such that the heat generated by the light source is transmitted between the light source and the heat-reducing part. In order to prevent the heat, the heat generated by the light source is effectively prevented from being transmitted to the heat dissipating part. be able to.

In the above configuration, if the cooling adiabatic passage is formed with an outside air intake port for forcibly passing outside air into the adiabatic passage and an exhaust device, air from the intake hole to the exhaust device is formed. The flow can be made extremely smooth, thereby increasing the heat removal efficiency. Also,
In the above configuration, when the heat-dissipating portion is formed of a photoreceptor, at least one of the partition walls forming the cooling adiabatic path is configured as a light-shielding wall that prevents light from a light source from entering the photoreceptor. With this configuration, the heat insulating device can also have a light shielding function.

Further, in this case, the optical device comprises a lattice projection type moiré device for taking in three-dimensional shape information and pattern information of the object to be measured, and the light source illuminates the object to be measured when the pattern information is taken in. When the photoreceptor comprises an imaging unit, the illumination lamp and the imaging unit are often arranged relatively close to each other, but the illumination lamp has a large heat value and the imaging unit Adopting the configuration of the present invention is particularly effective because it is susceptible to heat.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an optical device provided with a heat insulating device according to an embodiment of the present invention.
It is a perspective view showing the whole composition of a two-dimensional image scanner.
As shown, the three-dimensional image scanner 10 includes a measuring head 12, a power supply driving unit 14, a control unit 16
And a display unit 18. In the measuring head 12, three-dimensional shape information and a pattern (texture) of the measured object 2 are provided.
Information, and outputs these three-dimensional shape information and pattern information to the control unit 16 via the power supply device driving unit 14;
The control unit 16 combines the three-dimensional shape information and the pattern information to generate a three-dimensional image of the measured object 2, and displays the three-dimensional image on the display unit 18. A keyboard 20 and a mouse 22 are connected to the control unit 16. By operating these, a switching operation of the display content such as a change in the display angle of the three-dimensional image on the display unit 18 can be performed. Has become.

The acquisition of the three-dimensional shape information in the measuring head 12 is performed using a grid projection type moire topography. That is, the measuring head 12 has a function as a grating projection moiré device. In FIG. 1, a lattice plane Pg indicated by a two-dot chain line in front of the measuring head 12 is a virtual reference lattice plane in the lattice projection type moire topography.

FIG. 2 is a perspective view showing the appearance of the measuring head 12, and FIG. 3 is a perspective view showing the internal structure of the measuring head 12. As shown in these figures, the measuring head 12 includes a projection optical system 2 in a casing 24 (housing).
6, an observation optical system 28, a measurement object illumination system 30, and a heat insulating device 100 are provided.

The projection optical system 26 includes a projection lamp 32 (light source), a grid illumination system 38 including a heat ray cut filter 34 and a condenser lens 36, a projection grating 40, and a projection lens 42. The optical system 28
Photographing lens 44, observation reference grating 46, field lens 48, folding mirror 50, and CCD camera 5
Television optical system 5 composed of 2 (imaging unit, photoreceptor, and heat-dissipating unit)
4 is provided. The projection lens 42 and the photographing lens 44 are provided on the front surface of the casing 24 with their respective optical axes Ax.
1 and Ax2 are attached so as to be parallel to each other.

The grating illumination system 38 is arranged so as to irradiate the projection grating 40 obliquely from the rear left with respect to the optical axis Ax1, and the image of the projection lamp 32 is substantially at the entrance pupil position of the projection lens 42. An image is formed. The condenser lens 36 has a size enough to cover the projection grating 40.

On the other hand, the observation reference grating 46, the field lens 48 and the folding mirror 50 of the television optical system 54 are arranged on the optical axis Ax2,
The camera 52 has a mirror 50 with respect to the optical axis Ax2.
Are disposed on the optical axis folded at a right angle. The field lens 48 is arranged so that the light beam transmitted through the observation reference grating 46 is incident on the CCD camera 52.

Projection grating 40 and observation reference grating 46
Have grid lines extending in the vertical direction at the same pitch, and are provided in the same plane orthogonal to the optical axes Ax1 and Ax2. And the projection grating 40
Are arranged in a conjugate positional relationship with the virtual reference grid plane Pg so that the image of the projection grid 40 is formed on the virtual reference grid plane Pg (see FIG. 1).
The virtual reference lattice plane Pg is also arranged in a conjugate positional relationship with the virtual reference lattice plane Pg so that the image of the virtual reference lattice plane Pg is imaged on the observation reference lattice 46.

FIG. 4 is a plan view for explaining the function of the measuring head 12 as a grating projection type moiré device. As shown in the drawing, in the measurement head 12, an image of a projection grating 40 is projected onto the measured object 2 by the projection optical system 26, and the deformation grating formed on the measured object 2 by the observation optical system 28. An image is formed on an observation reference grating 46,
It is configured to observe moiré fringes generated thereby.

In FIG. 4, a virtual reference lattice plane Pg indicated by a dashed line and a plurality of planes indicated by solid lines parallel to the virtual reference lattice plane Pg form moire planes. Moiré fringes are formed along the curve where. In FIG. 4, the moire surface is shown by a solid line only on the near side of the virtual reference lattice plane Pg, but a plurality of moiré planes are also formed on the back side of the virtual reference lattice plane Pg. Therefore, moiré fringes are formed even when the measured object 2 is arranged so as to straddle the virtual reference lattice plane Pg back and forth.

As shown in FIG. 3, the projection grating 40 is supported by a grating feed mechanism 56, and is moved in a horizontal direction (ie, the grid of the projection grating 40) in a plane orthogonal to the optical axis Ax1 by the grating feed mechanism 56. (In the direction perpendicular to the line). The grating feed mechanism 56 is composed of a pulse stage, and
0 is caused to reciprocate (fringe scan) over the length of one phase. The reciprocating vibration may be performed using a piezoelectric element or the like instead of the pulse stage.

The movement of the projection grating 40 causes the projection grating 4
Since the phase between 0 and the observation reference grating 46 changes,
Moire fringes change with this. Therefore, the control unit 16 (see FIG. 1) samples the moiré fringe image for each 1/4 phase to determine the unevenness of the measured object 2.

On the other hand, the observation reference grating 46 is supported by a grating retreat mechanism 58, and is moved in a horizontal direction in a plane orthogonal to the optical axis Ax2 by the lattice retreat mechanism 58. , And a moiré fringe observation position located in the optical path and a retreat position deviating from the optical path can be selectively taken. The movement of the observation reference grid 46 is performed by manually inserting and extracting a grid retract knob 60 projecting from the right side surface of the casing 24 in the lattice retract mechanism 58. A limit switch 62 for detecting when the observation reference grid 46 has moved to the retreat position is attached to the grid retreat mechanism 58.

The moire fringe observation for taking in the three-dimensional shape information of the measured object 2 is performed in a state where the observation reference grating 46 is set at the moiré fringe observation position, and the observation reference grating 46 is moved to the retracted position. If it is retracted, it becomes possible to capture a two-dimensional image of the measured object 2 on which moire fringes are not formed. Thus, the measuring head 12 captures the pattern information of the measured object 2 by capturing the two-dimensional image.

It is to be noted that, instead of retracting the observation reference grating 46 to the retracted position, the projection grating 40 is retracted to a position deviated from the optical path of the projection optical system 26. Although it is possible to take two two-dimensional images, in such a case,
Since the observation reference grating 46 remains at the moiré fringe observation position, pseudo moire may occur between the observation reference grating 46 and the CCD camera 52.
Since the amount of light incident on the D camera 52 is also reduced by half, it is not so preferable.

As shown in FIG.
Is provided so as to be located between the projection optical system 26 and the observation optical system 28. The illumination system 30 for the object to be measured
Consists of an illumination lamp 64 (light source), a heat ray cut filter 66, and a diffuser window 68 attached to the front surface of the casing 24, and transmits light from the illumination lamp 64 to the heat ray cut filter 66 and the diffuser window 68.
The light is diffused forward through the device.

The illumination lamp 64 is not lit when observing moire fringes, but is lit when capturing a two-dimensional image. The projection lamp 32 of the lattice illumination system 38 is turned off in conjunction with this lighting operation. This switching of lighting is performed based on a detection signal of the limit switch 62.

As described above, the lighting switching from the projection lamp 32 to the illumination lamp 64 at the time of capturing a two-dimensional image is performed while the illumination lamp 64 is not lit and the projection lamp 32 is lit. If the two-dimensional image photographing is performed in the state described above, a two-dimensional image of the measured object 2 will be photographed in a state where the image of the projection grating 40 is formed. This is to avoid this. When the illumination lamp 64 is turned on, the influence of the image of the projection grating 40 is very small even if the projection lamp 32 is kept turned on. It is not always necessary to turn off the projection lamp 32.

Next, the heat insulating device 100 will be described.
The heat insulating device 100 is a device for preventing the heat generated by the projection lamp 32 and the illumination lamp 64 from being transmitted to the CCD camera 52. The heat insulating device 100 is configured to discharge air (heat) in the casing 24 to the outside. Cooling fans 70, 72
(Exhaust fan), and first, second, and third partition walls 74, 76, 78 made of a metal plate. The cooling fan 70 is attached to the left side wall of the casing 24, and the cooling fan 72 is attached to the rear wall of the casing 24.

The first partition wall 74 is provided so as to completely separate the projection lamp 32 and the illumination lamp 64 from the CCD camera 52. At that time, the cooling fan 7
The partitioning position of the first partition wall 74 is set so that 0 is located on both lamps 32 and 64 and the cooling fan 72 is located on the CCD camera 52 side. On the other hand, the second partition 76
Is provided on the opposite side of the first partition 74 with respect to both the lamps 32 and 64, and forms a cooling passage 102 between the second partition 76 and the first partition 74. Passage 10
2, the heat generated by both lamps 32 and 64 is cooled by cooling fan 7
It leads to zero.

The third partition 78 is more CC than the cooling fan 72 between the CCD camera 52 and the first partition 74.
It is provided so as to be located on the D camera 52 side.
An exhaust heat insulating path 104 is formed between the third partition 78 and the first partition 74, and air (heat) in the heat insulating path 104 is guided to the cooling fan 72.

As shown in FIG. 2, suction holes 80 and 82 are formed in the upper wall of the casing 24 above the lamps 32 and 64, respectively. The intake air from the intake holes 80 and 82 makes the flow of air (heat) in the cooling passage 102 and the exhaust heat insulating passage 104 smooth, thereby increasing the heat removal efficiency of the cooling fans 70 and 72. ing. The intake port 82
Is formed at a position straddling both the cooling passage 102 and the exhaust heat insulation passage 104.

On the right side of the casing 24, in addition to the lattice retract knob 60, a power switch 84 and a power indicator lamp 86 are provided, and an electronic board 88 is provided on the inner side. A power supply and signal cord 90 extends from the right side surface of the casing 24, and a power supply connector 92, a control signal connector 94, and a television signal connector 96 are provided at the other end by the power supply device drive unit 14 ( 1 (see FIG. 1).

As described in detail above, in the present embodiment, the illumination lamp 64 and the CCD camera 52 are disposed relatively close to each other in the casing 24 of the measuring head 12, and the projection lamp 32 is also provided. However, since the heat insulating device 100 is provided in the casing 24, it is possible to effectively prevent the heat generated by the lamps 32 and 64 from being transmitted to the heat-insulating portion. That is,
Since the first partition wall 74 is provided so as to separate the projection lamp 32 and the illumination lamp 64 from the CCD camera 52, the first partition wall 74 allows the two lamps 32,
Heat insulation between the CCD 64 and the CCD camera 52 can be achieved.

The heat generated by both lamps 32 and 64 is cooled by a cooling fan by means of a second partition 76 and a first partition 74 provided on the opposite side of first lamp 74 with respect to both lamps 32 and 64. Since the cooling passage 102 leading to 70 is formed, the compartments on both sides of the lamps 32 and 64 separated by the first partition 74 can be efficiently ventilated and cooled. 74 can be suppressed.

Further, the CCD camera 52 and the first partition 7
A third partition 78 is provided between the third partition 78 and the first partition 74, and an exhaust heat insulating path 104 is formed between the third partition 78 and the first partition 74 so that air (heat ) Is led to the cooling fan 72, so that both lamps 32, 6
4 emits heat through the first partition 74 to the CCD camera 5.
2 can be effectively prevented.

Therefore, according to the present embodiment, it is possible to ensure the protection of the CCD camera 52. In the present embodiment, the intake holes 80 formed in the upper wall of the casing 24 above the lamps 32 and 64,
By the intake air from 82, the flow of air (heat) in the cooling passage 102 and the exhaust heat insulating passage 104 can be made smooth, so that the cooling fan 70,
72 can increase the heat removal efficiency.

Further, the first and third partition walls 74 and 78
Since both are made of metal, both lamps 32, 64
Light from the CCD camera 52 can be reliably prevented from entering the image receiving surface of the CCD camera 52. Note that the heat insulating device in the optical device of the present invention is not limited to the above-described embodiment. For example, a structure in which the cooling fan 72 is not provided or a structure in which the intake hole 82 is not provided in the exhaust heat insulating path 104 is used. Of course, it is also possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a three-dimensional image scanner in which an optical device having a heat insulating device according to an embodiment of the present invention is incorporated as a measuring head.

FIG. 2 is a perspective view showing the appearance of a measuring head.

FIG. 3 is a perspective view showing an internal structure of a measuring head.

FIG. 4 is a plan view for explaining the function of the measuring head as a grating projection moiré device.

[Explanation of symbols]

 2 object to be measured 10 three-dimensional image scanner 12 measuring head (grating projection type moiré device) 24 casing (housing) 26 projection optical system 28 observation optical system 30 object to be measured illumination system 32 projection lamp (light source) 34 heat ray cut filter 36 Condenser lens 38 Lattice illumination system 40 Projection grating 42 Projection lens 44 Shooting lens 46 Observation reference grating 48 Field lens 50 Folding mirror 52 CCD camera (Imaging unit, photoreceptor, Anti-warming unit) 54 Television optical system 64 Illumination lamp ( Light source) 66 Heat ray cut filter 68 Diffuser window 70, 72 Cooling fan (exhaust fan) 74 First partition 76 Second partition 78 Third partition 80, 82 Intake hole 100 Insulation device 102 Cooling passage 104 Exhaust insulation passage Ax1, Ax2 Optical axis Pg Virtual reference lattice plane

Claims (4)

[Claims] 1. A light source and a heat-reducing part are housed in a common housing, and a heat insulating partition is provided between the light source and the heat-reducing part. In a heat insulating device in an optical device adapted to prevent transmission, the heat insulating partition may form at least two cooling heat insulating paths.
A heat insulating device in an optical device, comprising a heavy partition. 2. The heat insulating apparatus according to claim 1, wherein the cooling heat insulating path is provided with an outside air intake port and an exhaust device for forcibly passing outside air into the heat insulating path. . 3. The heat-dissipating portion comprises a photoreceptor, and at least one of the partition walls forming the cooling heat-insulating path is configured as a light-shielding wall for preventing light from the light source from entering the photoreceptor. The heat insulating device in the optical device according to claim 1, wherein: 4. The illumination device according to claim 1, wherein the optical device comprises a lattice projection type moiré device that captures three-dimensional shape information and pattern information of the measured object, and the light source illuminates the measured object when capturing the pattern information. The light receiving body comprises an imaging unit.
A heat insulating device in the optical device according to Claim.