JP6645722B2 - Optical device housing structure - Google Patents

Description

  The present invention relates to a housing structure of an optical device, and more particularly to a housing of an optical device that can prevent the inside of the optical device from being in a high-humidity state and reliably prevent dew condensation on an optical window. It is about body structure.

  Conventionally, as an actuator having a structure in which a flat movable part is pivotally supported on a frame-shaped fixed part, for example, using a semiconductor manufacturing technique, a silicon substrate is anisotropically etched, and a frame-shaped fixed part is formed. A flat movable part and a fixed part are integrally formed with a support beam that supports the movable part, a drive coil is provided in the movable part, and a static magnetic field is applied to the drive coil of the movable part, such as a permanent magnet. An electromagnetically driven planar actuator that includes a static magnetic field generating means, and oscillates a movable part using Lorentz force generated by the interaction between a magnetic field generated in the drive coil by energization and a static magnetic field generated by the static magnetic field generating means. Many are used. Such an actuator is applied to, for example, an optical device such as an optical scanner that deflects and scans a light beam by providing a mirror in a movable portion.

  In such an optical device, an optical window made of glass or the like for irradiating a light beam and receiving reflected light of the light beam is provided, and this optical window lowers the external temperature of the optical device. This may cause dew condensation. Among such optical devices, an optical device that can ensure a relatively large volume of the housing is easy to disperse heat generated inside the device, so that even if the outside air temperature is slightly lowered, the optical window Is hard to reach the dew point, and no condensation occurs.

  However, in optical devices that require miniaturization, the heat generated inside the optical devices tends to increase due to high-density mounting and insufficient heat radiation, and this heat causes moisture absorbed by the substrate and resin members inside the devices. Is released, and the inside becomes high temperature and high humidity. As a result, there is a problem that the optical window of the optical device is easily dewed.

  Conventionally, as a technique for preventing dew condensation on such optical devices, for example, a humidity control material is installed inside a housing of an optical device such as a monitoring camera used indoors and outdoors, and the humidity control material absorbs water vapor. A technique has been disclosed in which dew condensation is repeated to prevent dew condensation inside an optical device (for example, see Patent Document 1).

JP 2005-33438 A

  However, in the technology described in Patent Literature 1, the humidity inside the optical device is adjusted by the humidity control material. When the high temperature and high humidity are released by the heat generated by the device, the absorption of moisture may not be in time, and there is a problem that the dew condensation on the optical window of the optical device cannot be reliably prevented.

  The present invention has been made in view of the above points, and can prevent the inside of an optical device from becoming a high humidity state, and can reliably prevent dew condensation on an optical window. It is intended to provide a structure.

In order to achieve the above object, the present invention provides a housing structure for an optical device according to the first aspect of the present invention, which partitions an internal space of the housing and includes a partition having moisture permeability, and the partition defines the internal space. A control for storing a control device for controlling the optical device, including a humidity control material for suppressing a change in humidity due to moisture permeability of the partition wall, in an optical storage space for storing an optical device among the spaces formed by partitioning the optical device. in the storage space, with a moisture releasing portion communicating to the outside through the moisture permeable membrane, to the optical housing space, characterized in that it is provided an optical window.
Invention, according to claim 1, wherein the optical window, characterized by being kicked set on the end surface sandwiching the humidity material between the partition wall of the end face forming the optical storage space according to claim 2 And

According to a third aspect of the present invention, in any one of the first and second aspects, the partition is made of a resin having moisture permeability.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the partition is provided with a moisture-proof coating.

According to the invention of claim 1, the partition wall having a moisture permeability, of the space formed by partitions the internal space in the partition wall, in the optical housing space for housing the optical device, the humidity by moisture permeability of the partition wall comprising a a change suppressing humidity material, in the control housing space for housing a control device for controlling the optical apparatus, since as comprising a moisture releasing portion communicating to the outside through the moisture permeable membrane, for example, the interior space immediately without transmitting the other moisture in one of spaces formed by partitions, and by suppressing the change of humidity, it is possible to reliably prevent condensation of optics, furthermore, form divides the inner space the humidity of the spatial can be kept constant. More specifically, the moisture in the control storage space is not immediately transmitted to the optical storage space, and the increase in the humidity of the optical storage space provided with the optical window is suppressed, whereby the dew condensation of the optical device is reliably prevented. be able to. Furthermore, since the humidity control material is provided in the optical storage space, the internal humidity of the optical storage space can be kept constant by absorbing or releasing the moisture inside the optical storage space. Further, since the partition wall and the humidity control material can maintain the internal humidity of the optical storage space to a degree that dew condensation does not occur, it is not necessary to completely separate the optical storage space from the control storage space in an airtight manner. This facilitates the processing of wiring and the like routed between the control space and the control storage space, simplifies the design, reduces manufacturing costs, and improves disassembly. Further, since the so provided moisture releasing portion communicating to the outside through the moisture permeable membrane to control the storage space, when the external humidity is less than the internal humidity of the control housing space is controlled housing by moisture releasing section Moisture inside the space can be released to the outside.

According to the invention according to claim 3 , since the partition is made of a resin having moisture permeability, the partition allows the moisture in one of the spaces formed by partitioning the internal space, for example, to be immediately transmitted to the other. By suppressing the rise in humidity, dew condensation on the optical device can be reliably prevented.

According to the invention according to claim 4 , since the partition wall is provided with the moisture-proof coating, the moisture-proof coating can further prevent moisture from entering from one side to the other of the space formed by partitioning the internal space, for example. it can.

1 is a schematic configuration diagram illustrating an embodiment of a housing structure of an optical device according to the present invention. It is explanatory drawing which shows the experimental result which measured temperature and humidity in the optical storage space in embodiment of the housing | casing structure of the optical device which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing an embodiment in which a housing structure of an optical device according to the present invention is applied to a range image sensor having a planar actuator.

  As shown in FIG. 1, the housing structure of the optical device of the present embodiment includes a box-shaped housing 1. One side of the housing 1 is, for example, a planar actuator (optical device). (Not shown) is provided in the optical storage space 2. On the other side of the housing 1, there is provided a control storage space 3 in which a control device for controlling the planar actuator is stored, and between the optical storage space 2 and the control storage space 3. And a semi-sealed partition wall 4 for partitioning the two. The semi-enclosed partition wall 4 is made of, for example, a material having moisture permeability such as resin, and does not immediately transmit the moisture in the control storage space 3 to the optical storage space 2, but gradually with the passage of time. It has the property of allowing moisture to pass through. The surface of the semi-sealed partition 4 may be provided with a moisture-proof coating. By applying the moisture-proof coating in this way, it is possible to further prevent moisture from entering the optical storage space 2 from the control storage space 3.

Further, a transparent optical window 5 for emitting and receiving light by an optical device is provided on an end surface of the housing 1 on the side of the optical storage space 2, and a humidity control is provided inside the optical storage space 2. Material 6 is installed. The humidity control material 6 has a property of keeping the humidity at about 60%, and the humidity control material 6 has a function of repeatedly absorbing and releasing moisture in order to maintain the humidity. Further, on both sides of the control storage space 3 of the housing 1, there are provided moisture release units 7 which communicate with the outside through the moisture permeable membrane. To the outside.
Next, the operation of the present embodiment will be described.

  Usually, a control device is housed in the control storage space 3, and since this control device contains many resin materials, it causes moisture to be generated in the control device. Therefore, by isolating the control storage space 3 and the optical storage space 2 by the semi-sealed partition 4, it is possible to temporally prevent moisture generated by the control device from entering the optical storage space 2. .

  In this case, since the semi-sealed partition wall 4 is not completely sealed, moisture will enter the optical storage space 2 from the control storage space 3 with the passage of time. However, since the humidity control material 6 is provided inside the optical storage space 2, moisture entering the optical storage space 2 from the control storage space 3 is absorbed by the humidity control material 6, and It is possible to keep the internal humidity constant.

  When the control device is operated, the control device generates heat. Therefore, when the relative humidity decreases in the control storage space 3 and becomes lower than the internal humidity of the optical storage space 2, the inside of the optical storage space 2 decreases. Moisture gradually enters the control storage space 3 via the semi-closed partition 4, and the internal humidity of the optical storage space 2 decreases.

  In this case, when the humidity of the optical storage space 2 decreases, the humidity control material 6 releases accumulated moisture, and the humidity control material 6 can appropriately maintain the internal humidity of the optical storage space 2. Things. As described above, since the humidity control material 6 has a function of repeating the absorption and release of the surrounding humidity, the life and replacement due to the moisture absorption capacity of the humidity control material become unnecessary, and the humidity control material can be used for a long period of time. The amount of the wet material 6 can be suppressed to a very small amount as compared with the moisture absorbent.

  When the humidity of the outside is lower than that of the control storage space 3, the humidity of the control storage space 3 is released to the outside via the moisture release unit 7.

  FIG. 2 shows an experimental result of measuring the temperature and humidity in the optical storage space 2 by installing the housing 1 having a built-in planar actuator in an atmosphere at an ambient temperature of 25 ° C. and an ambient humidity of 95%. It is.

  In this case, when the housing 1 is left for two days, the humidity in the optical storage space 2 gradually increases because the moisture in the control storage space 3 gradually enters the optical storage space 2 by the semi-enclosed partition wall 4. I do.

  When the control device is operated, the humidity of the optical storage space 2 temporarily increases due to a rise in the temperature of the control device. However, the humidity is greatly increased by absorbing moisture by the humidity control material 6. Can be suppressed. Then, due to a rise in the temperature of the control device, the internal humidity of the control storage space 3 starts to relatively decrease, and accordingly, the humidity of the optical storage space 2 also decreases.

  When the operation of the control device is stopped, the temperature of the control device decreases, so that the humidity in the optical storage space 2 relatively increases. However, when the control device is operated again, the humidity starts to decrease. As described above, according to the results of this experiment, it is possible to suppress the internal humidity of the optical storage space 2 to a certain level or less, and it is generally assumed that dew condensation occurs at a humidity of 80% or more. In the embodiment, it can be seen that the internal humidity of the optical storage space 2 can be suppressed to about 65% or less, and the occurrence of dew condensation on the optical window 5 can be prevented.

  As described above, in the present embodiment, since the semi-sealed partition wall 4 that partitions the optical storage space 2 and the control storage space 3 is provided between the optical storage space 2 and the control storage space 3, the moisture in the control storage space 3 is immediately optically controlled. By suppressing the increase in the humidity of the optical storage space 2 without transmitting the light through the storage space 2, dew condensation of the optical device can be reliably prevented.

  In addition, a moisture absorbing material is provided in the optical storage space 2, and the moisture inside the optical storage space 2 is absorbed or released by the moisture absorbing material, so that the internal humidity of the optical storage space 2 is kept constant. Therefore, there is no need to replace the life or replace the hygroscopic material due to its hygroscopic capacity. Even when the hygroscopic material 6 is used for a long period of time, the application amount can be suppressed to a very small amount as compared with the hygroscopic material. Further, since the semi-sealed partition wall 4 and the humidity control material 6 can maintain the internal humidity of the optical storage space 2 to such an extent that condensation does not occur, the optical storage space 2 and the control storage space 3 are completely airtightly separated. There is no need for this, and processing such as wiring routed between the optical storage space 2 and the control storage space 3 is facilitated, so that design can be simplified, and manufacturing costs can be reduced and disassembly can be improved. Can be planned.

  Furthermore, since the moisture release portions 7 communicating with the outside via the moisture permeable membrane are provided on both sides of the control storage space 3 of the housing 1, the moisture release inside the control storage space 3 is controlled by the moisture release portions 7. Can be released to the outside. Also. By applying a moisture-proof coating to the surface of the semi-sealed partition 4, it is possible to further prevent moisture from entering the optical storage space 2 from the control storage space 3.

  Note that the present invention is not limited to the above embodiment, and various modifications can be made based on the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Housing 2 Optical storage space 3 Control storage space 4 Semi-closed partition 5 Optical window 6 Humidity control material 7 Humidifier

Claims (4)

Partitioning the internal space of the housing, comprising a partition having moisture permeability,
In the optical storage space for storing the optical device, of the space formed by partitioning the internal space with the partition, a humidity control material for suppressing a change in humidity due to the moisture permeability of the partition is provided, and the optical device is controlled. In the control storage space for storing the control device to be provided , provided with a moisture release section that communicates with the outside through a moisture permeable membrane ,
An optical device housing structure , wherein an optical window is provided in the optical storage space . The optical window, the casing of the optical apparatus according to claim 1, characterized in that it is kicked set on the end surface sandwiching the humidity material between the partition wall of the end face forming the optical receiving space Construction. The septum housing structure of an optical device according to any one of claims 1 and 2, characterized in that it is constituted by a resin having a moisture permeability. The housing structure of an optical device according to any one of claims 1 to 3 , wherein the partition wall is provided with a moisture-proof coating.

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