JP2017116733A - Laser scanner device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to suppress disturbance of an image to be created.SOLUTION: A display device comprises: a reflection part 31a that reflects a composite light beam (laser beam) C made incident thereon and is driven at a high speed to scan the composite light beam C and create an image M; and a third case 31b that stores the reflection part 31a. The third case 31b is sealed by filling the inside thereof with a gas having a lower molecular weight than the average molecular weight of air.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser scanner device that generates an image by scanning light and a display device.

  Patent Document 1 discloses a laser scanner in which a movable reflecting portion that receives laser light and scans the laser light in a two-dimensional direction is provided in a natural atmosphere.

  Patent Document 2 discloses a laser scanner device in which a reflection portion is provided in a decompressed case.

JP 2009-003282 A JP 2012-137586 A

  However, in the laser scanner device disclosed in Patent Document 1, since the reflecting portion is provided in a natural atmosphere, the operation may become unstable due to air resistance when vibrating, and the generated image may be disturbed. It was.

  In addition, in the laser scanner device disclosed in Patent Document 2, since the reflecting portion is provided in the decompressed case, unstable operation due to air resistance is suppressed, but the decompression environment can be reduced over a long period of use. May be lost, and the generated image may be disturbed as described above.

  The present invention provides a laser scanner device or a display device that can suppress disturbance of an image to be generated.

  In order to solve the above problem, a laser scanner device according to the present invention houses a reflection unit that reflects incident laser light and generates an image by scanning the laser beam by driving at high speed, and the reflection unit. A case having a molecular weight lower than the average molecular weight of air.

  The display device of the present invention includes a light source that emits laser light, a reflection unit that reflects the laser light and scans the laser light to generate an image by driving at high speed, the light source, and the reflection And a case for storing a portion, wherein the case is filled with a gas having a molecular weight lower than the average molecular weight of air.

  The present invention can suppress disturbance of an image to be generated.

It is a schematic plan view which shows the display apparatus of embodiment of this invention.

  Hereinafter, an embodiment of a scanning display device of the present invention will be described with reference to the accompanying drawings.

  The display device 10 includes a light source module 20 that emits a combined light beam C, a scanning module 30 that scans the combined light beam C emitted from the light source module 20 to generate an image, and a composite that is scanned by the scanning module 30. A transmissive screen 40 that forms an image of the light beam C on the surface and displays an image M; a light source module 20; a scanning module 30; and a first case 50 that houses the transmissive screen 40 therein. The scanning module 30 scans the combined light beam C emitted from the module 20 on the transmission screen 40, thereby generating an image M on the surface of the transmission screen 40. The first case 50 accommodates the light source module 20, the scanning module 30, and the transmission screen 40, and is hermetically sealed by filling a gas having a molecular weight lower than the average molecular weight of air. Note that the first case 50 only needs to accommodate at least the scanning module 30, and the light source module 20 and the transmissive screen 40 may be outside the first case 50.

  The first case 50 is made of, for example, a synthetic resin or a metal, and includes a concave storage portion (not shown) having an opening and a lid portion (not shown) that closes the opening of the storage portion. A hermetic seal is provided by providing a rubber packing or a gasket formed of metal or resin between the lid portion. In addition, the method of hermetically sealing the first case 50 includes a hermetic sealing technique in which the housing portion and the lid portion are engaged, and then sealed with glass, ceramic, silver solder, metal, or the like from the outside. It may be used. In addition, as a method of hermetically sealing the first case 50, a welding technique by laser welding or resistance heating may be used for the storage portion and the lid portion. The first case 50 may be hermetically sealed so that it is difficult to exchange gas with the outside, even if it is not hermetically sealed. Thus, it is possible to keep a gas having a low molecular weight inside the first case 50.

  In addition, the average molecular weight of air here specifically shows 28.8 g / mol when the ratio of the gas which occupies air is 80% of nitrogen (N2) and 20% of oxygen (O2). Further, a gas having a molecular weight lower than the average molecular weight of air specifically means nitrogen (N2) having a molecular weight of 28.0 g / mol, neon (Ne) having a molecular weight of 20.2 g / mol, and 4.0 g / mol. Helium (He) is included, and a mixed gas of two or more of these nitrogen (N2), neon (Ne), and helium (He) is also included.

(Light source module)
The light source module 20 (light source device) combines the light beams of the three primary colors of the red light beam R, the green light beam G, and the blue light beam B and emits them as one combined light beam C. The light source 21 and the condensing optical system 22 and a dichroic mirror 23 are fixed.

  The light source 21 is a semiconductor laser and includes a first light source 21r that emits a red light beam R, a second light source 21g that emits a green light beam G, and a third light source 21b that emits a blue light beam B.

  The condensing optical system 22 has a convex surface on one side or a convex shape on both sides, and is composed of a lens that converts divergent light emitted from the light source 21 into convergent light, and is on the optical path of the red light beam R emitted from the first light source 21r. The first condensing optical system 22r disposed on the second light collecting optical system 22g disposed on the optical path of the green light beam G emitted from the second light source 21g, and the blue light beam emitted from the third light source 21b. And a third condensing optical system 22b disposed on the B optical path, and a lens that corrects aberration so that incident light beams R, G, and B are condensed at a predetermined position.

  The dichroic mirror 23 is a mirror in which a thin film such as a dielectric multilayer film is formed on a mirror surface, and is a first dichroic mirror disposed at a predetermined angle on the optical path of the red light beam R that has passed through the first condensing optical system 22r. 23r, the second dichroic mirror 23g disposed at a predetermined angle on the optical path of the green light beam G that has passed through the second condensing optical system 22g, and the optical path of the blue light beam B that has passed through the third condensing optical system 22b. And a third dichroic mirror 23b disposed at a predetermined angle to align the optical axes of the red light beam R, the green light beam G, and the blue light beam B in substantially the same direction. The dichroic mirror 23 is fixed to a locking portion provided on a second surface 262 of the light source casing 26 described later.

(Scanning module)
The scanning module 30 receives the combined light beam C from the light source module 20 and generates an image M on the transmission screen 40 by scanning the combined light beam C. The scanning module 30 scans the second case 34. The unit 31, the mirror 32, and the monitor sensor 33 are accommodated. The second case 34 is hermetically sealed with a gas having a molecular weight lower than the average molecular weight of air. In addition, the airtight sealing method similar to the 1st case 50 mentioned above can be applied also to the sealing method of the 2nd case 34. FIG.

  The mirror 32 is arranged at a predetermined angle on the optical path of the combined light beam C emitted from the light source module 20, and reflects the combined light beam C from the light source module 20 toward the scanning unit 31. The reflectance of the mirror 32 is adjusted in advance, and several percent of the combined light beam C passes through the mirror 32 and enters the light receiving surface of the monitor sensor 33.

  The monitor sensor 33 is a color sensor or the like, detects the light intensity of each color of the combined light beam C, and outputs it to a control unit (not shown). The control unit adjusts the current supplied to the light source 21 based on the detection signal from the monitor sensor 33.

  The scanning unit (laser scanner device) 31 includes a reflection unit 31a that reflects the combined light beam C from the light source module 20 and a third case 31b that houses the reflection unit 31a in a two-dimensional direction.

  Specifically, the reflecting portion 31a is configured by a mirror device such as a polygon mirror, a galvanometer mirror, or a MEMS (Mechanical Electro Mechanical System) mirror, and the received combined light beam C is rapidly transmitted in the main scanning direction on the transmission screen 40. A desired image M is displayed on the transmission screen 40 by performing scanning (sub scanning) in a sub scanning direction orthogonal to the main scanning direction while performing reciprocating scanning (main scanning) a plurality of times. The third case 31b is hermetically sealed with a gas having a molecular weight lower than the average molecular weight of air. In addition, the airtight sealing method similar to the 1st case 50 mentioned above is applicable also as the sealing method of the 3rd case 31b.

  The transmission screen 40 receives the image light K from the scanning unit 31 on the back surface and transmits the image light K to display the image M on the front surface side. For example, the transmission screen 40 is formed by a holographic diffuser, a microlens array, a diffusion plate, or the like. Composed.

  As described above, the light source module 20 (light source device) in the present embodiment reflects the incident combined light beam (laser light) C and scans the combined light beam C by being driven at high speed to generate the image M. A third case 31b that houses the reflecting portion 31a and the reflecting portion 31a, and the third case 31b is filled with a gas having a molecular weight lower than the average molecular weight of air; According to the configuration, air resistance when the reflecting portion 31a is driven at high speed is reduced, and disturbance of an image to be generated can be suppressed.

  As described above, the third case 31b for housing the reflecting portion 31a, the second case 34 for housing the third case 31b and other optical members (mirrors 32), and the second case 34. The first case 50 that houses the light source module 20 is formed so that light passes through the light-transmitting portions and other portions are light-shielding.

  In the above description, a gas having a molecular weight lower than the average molecular weight of air is filled around the reflection unit 31a of the scanning unit 31, but the surroundings when the reflection unit 31a is driven at high speed are used. Since the drag force received from the gas is proportional to the density of the surrounding gas, in the present invention, the density of the gas around the reflecting portion 31a of the scanning unit 31 is lower than the air density of 1.28 g / L at the standard atmospheric pressure of 1 atm. That's fine. That is, even if pressurized and sealed within 1.03 atm for nitrogen (N2), 1.43 atm for neon (Ne), or 7.2 atm for helium (He), the surroundings of the reflective portion 31a The gas density can be lower than the air density at standard pressure. By sealing in a state in which the internal gas is pressurized, it is difficult for external air to enter the periphery of the reflecting portion 31a, and it is possible to maintain an environment where the driving of the reflecting portion 31a is not burdened for a long time. The pressure to be applied is preferably set to less than 1.02 atm in consideration of the load applied to the case and gas expansion / contraction due to temperature change.

  In the above description, the inside of the third case 31b that houses the reflecting portion 31a, the inside of the second case 34 that houses the third case 31b and other optical members (mirror 32), and this All of the second case 34 and the inside of the first case 50 that houses the light source module 20 were filled with a gas having a molecular weight lower than the average molecular weight of air, but enclosed in at least one case. May be. When the outer case is filled with a gas having a low molecular weight, the inner case does not necessarily have an airtight structure, and the inner case itself may not be provided. When the outer case is filled with a low molecular weight gas and the inner case is not filled with a low molecular weight gas, the inner case is preferably not provided with an airtight structure.

DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Light source module 21 Light source (semiconductor laser)
22 Condensing optical system (optical member)
23 Dichroic mirror (optical member)
Reference Signs List 30 Scan Module 31 Scan Unit 31a Reflector 31b Third Case 32 Mirror 33 Monitor Sensor 34 Second Case 40 Transmission Screen 50 First Case C Composite Light K Image Light M Display Image

Claims (6)

A reflection unit that reflects incident laser light and scans the laser light to generate an image by driving at high speed;
A case for storing the reflecting portion;
The case is filled with a gas having a molecular weight lower than the average molecular weight of air. The case seals the gas at a pressure lower than atmospheric pressure.
The laser scanner device according to claim 1. The gas comprises nitrogen, neon, helium, or a mixed gas of two or more of these nitrogen, neon, and helium.
The laser scanner device according to claim 1, wherein the laser scanner device is a laser scanner device. A light source that emits laser light;
A reflection unit that reflects the laser light from the light source and generates an image by scanning the laser light by driving at a high speed;
A case for storing the light source and the reflecting portion;
The case is filled with a gas having a molecular weight lower than the average molecular weight of air. The case seals the gas at a pressure lower than atmospheric pressure.
The display device according to claim 4. The gas comprises nitrogen, neon, helium, or a mixed gas of two or more of these nitrogen, neon, and helium.
The display device according to claim 4, wherein the display device is a display device.

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