JP2012128999A - Light source element, light souve device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost of assembly for fixing a light source to a heat dissipation element, and also prevent the solid light emtting element or collimator lense from being damaged due to heat generated in manufacturing of the light source element.SOLUTION: The light source element includes a solid light emitting element, a case with a light emitting part for storing the solid light emitting element and taking out to the outside light emitted from the solid light emitting element, a collimator lens for nearly parallelizing light emitted from the solid light emitting element, and a rtainer part retaining the collimator lens. The retainer part is fixed to the case, and part of the case is exposed from the retainer part as seen from an emission direction of light.

Description

  The present invention relates to a light source element, a light source device, and a projector including the light source element or the light source device.

  In recent years, solid-state light emitting elements such as light emitting diodes and semiconductor lasers are being used as illumination light sources or projector light sources. For example, as described in Patent Document 1, a light source element and a light source device are known in which a power light emitting diode is fixed to a heat dissipation element by laser spot welding.

JP 2004-297065 A

  However, in the light source element and the light source device described in Patent Document 1, when a plurality of light source elements are fixed to the heat dissipation element, each light source element needs to be individually laser spot welded, and it takes a long time to fix, There was a problem that the cost increased.

  Also, when fixing a solid light emitting element to a heat dissipation element using laser spot welding, the heat dissipation element dissipates the heat necessary for laser spot welding, so the output of laser spot welding must be increased, There is a problem that heat is conducted to the light emitting element and the solid light emitting element is likely to be damaged.

  In a light source device in which a plurality of solid state light emitting elements are arranged, when a collimating lens for converting light emitted from the solid state light emitting elements into parallel light is previously fixed to the solid state light emitting elements, laser spot welding is used to fix the solid state light emitting elements. However, since the temperature of the collimator lens becomes high, it is difficult to use a resin material for the collimator lens, which increases the cost.

  Also, when fixing / fixing the collimator lens after fixing the solid light emitting element to the heat dissipation element and fixing the solid light emitting element to the heat dissipation element, the light source elements are fixed and fixed. A space is required for the actuator to move, and the movement trajectory becomes complicated. For this reason, there is a problem that the time required for assembly becomes longer and the cost increases.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A light source element according to this application example includes a solid-state light-emitting element, a housing including the solid-state light-emitting element and a light emitting unit that extracts light emitted from the solid-state light-emitting element to the outside, and the solid-state element A collimator lens for collimating the light emitted from the light emitting element; and a holding portion for holding the collimator lens, the holding portion being fixed to the casing, and viewed from the light emitting direction. A part of the casing is exposed from the holding portion.

Therefore, according to this application example, since the part of the casing is exposed from the holding portion when viewed from the light emitting direction, the exposed part of the casing is The bottom of the solid light source element can be pressed against the heat dissipating element from the light emitting direction side, and an effect of enabling stable cooling of the solid light source element can be obtained.
Further, the solid light source element can be fixed to the heat radiating element without using fixing means with heat generation such as laser spot welding. Therefore, it is possible to obtain an effect that the solid state light emitting device is not damaged by heat.

  Application Example 2 In the light source element according to the application example described above, it is preferable that the holding portion is made of a material that transmits ultraviolet light and is fixed to the casing with ultraviolet curable resin.

According to this application example, since the holding portion is made of a material that transmits ultraviolet rays, an ultraviolet curable resin can be used for fixing the holding portion and the housing.
Further, a resin material can be used for the holding portion, and an effect of cost reduction can be obtained.
Further, a resin material can be used for the collimator lens, and an effect of cost reduction can be obtained.

Application Example 3 The light source device described in this application example is characterized in that the light source elements described in Application Examples 1 and 2 are attached to a plurality of heat dissipation elements.
According to this application example, the collimator lens can be assembled and adjusted and fixed to the solid state light emitting device, and then assembled to the heat dissipation element.

Therefore, it is very easy to assemble the light source device as compared with the case where the collimator lens is assembled and adjusted after the solid light emitting element is fixed to the heat dissipation element.
Application Example 4 A projector described in this application example projects a light modulation element that modulates light emitted from the light source device shown in Application Example 3 in accordance with image data, and light modulated by the light modulation element. And a projection unit.

  Therefore, according to this application example, a projector using a light source device that can be easily assembled can be configured, and thus an inexpensive projector can be provided.

1 is a perspective view according to Embodiment 1. FIG. FIG. 3 is a top view according to the first embodiment. 1 is an exploded perspective view according to Embodiment 1. FIG. Sectional drawing which concerns on Embodiment 2. FIG. FIG. 6 is a perspective view according to Embodiment 2. FIG. 6 is a configuration diagram according to a third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each layer and each member is made different from the actual scale so that each layer and each member can be recognized.

(Embodiment 1)
FIG. 1 is a perspective view of Embodiment 1 of a light source element according to the present invention. FIG. 2 is a top view according to the first embodiment. FIG. 3 is an exploded perspective view according to the first embodiment. FIG. 4 is a diagram illustrating a state in which the light source element is pressed against the heat dissipation element.

First, a schematic configuration of the light source element according to Embodiment 1 will be described.
The light source element 1 includes a laser diode 5 (hereinafter referred to as an LD) as a solid light emitting element, a casing 2 that houses the laser diode 5, a collimator lens 4, and a lens stay 3 as a holding unit that holds the collimator lens 4. It consists of

  The housing 2 includes an eyelet part 201 and a cap part 202, and houses the LD5.

  The cap portion 202 includes a cylindrical tube portion 202b and an opening portion 202a with the light emission direction as an axis, and the LD 5 is accommodated in a space formed by the eyelet portion 201 and the cap portion 202. The cap part 202 has an opening 202a as a light emitting part from which the light emitted from the LD 5 is emitted.

  The lens stay 3 has a portion 3a on which the collimator lens 4 is mounted, and the lens stay 3 and the collimator lens 4 are fixed by UV adhesive, other adhesive, or welding.

  The lens stay 3 to which the collimator lens 4 is fixed is adjusted to a position that makes the light emitted from the LD substantially parallel to the cap portion 202.

  The lens stay 3 to which the collimator lens 4 is fixed is position-adjusted with respect to the cap portion 202 and then fixed to the tube portion 202b of the cap portion 202 with a UV adhesive as an ultraviolet curable resin.

  The lens stay 3 is made of glass, transparent resin, or translucent resin as a material that transmits ultraviolet rays.

  As shown in FIG. 2, the lens stay 3 has a structure having an exposed portion 2 a where a cap 202 and a part of the eyelet 201 are exposed when viewed from the light emitting direction of the LD 5. As will be described later, when the light source element 1 is pressed and fixed to the heat dissipating element 11 (FIG. 4), a pressing force is applied to the exposed portion 2a. That is, an exposed portion is provided to apply a pressing force.

The arrows described in FIG. 3 indicate the direction in which the light source element 1 is pressed against the heat dissipation element 11 (FIG. 4).
As described above, according to the light source element 1 according to the present embodiment, the following effects can be obtained.

  As will be described later (FIG. 4 and the like), since the exposed portion 2a can be pressed when the light source element 1 is pressed and fixed to the heat dissipation element 11, a structure for stably cooling the light source element 1 is obtained. Can do.

  In addition, the light source element 1 can be fixed by pressing the exposed portion 2a, and the light source element 1 can be fixed without using a method involving heat generation such as laser spot welding, so that the LD 5 is damaged by heat. There is an effect that there is no.

  Furthermore, since unnecessary stress is not applied to the collimator lens 4 and the lens stay 3 by pressing the exposed portion 2a, the position of the collimator lens 4 does not shift with respect to the LD 5.

  When fixing the housing 2 to the heat dissipating element 11, since a fixing method with heat generation such as laser spot welding is not used, the collimator lens 4 can be formed of resin, and the cost can be reduced.

(Embodiment 2)
FIG. 4 is a sectional view of Embodiment 2 of the light source device according to the present invention. FIG. 5 is a perspective view of Embodiment 2 of the light source device according to the present invention. The light source device 10 includes a plurality of light source elements 1 and heat dissipation elements 11. The heat dissipating element 11 is a plate-like member, and a plurality of circular recesses into which the eyelet part 201 of the light source element 1 is press-fitted are formed on the surface. By placing the light source element 1 in this recess and pressing the exposed portion 2a of each light source element 1 from top to bottom (in the direction of the arrow in FIG. 4) using the pressing jig 12, the eyelet part 201 is pressed. Is press-fitted into the circular recess and contacts and is fixed to the heat dissipating element 11. At that time, the pressing jig 12 can press-fit a plurality of light source elements 1 at a time. In addition, when pressing the exposed part 2a, by pressing the eyelet part 201 of the exposed part 2a, a minimum pressing force can be applied to the light source element 1, and deformation of the light source element 1 can be prevented. it can.

  As described above, according to the light source device 10 according to the present embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.

  Since the position of the collimator lens 4 is adjusted for each of the light source elements 1 alone, it is not necessary to adjust the position of the collimator lens 4 after the housing 2 is attached to the heat dissipating element 11. Accordingly, a plurality of light source elements can be arranged in a narrow space, and an expensive adjustment device is not required, so that it can be manufactured at a low cost.

  Moreover, since it is not necessary to fix the light source elements 1 to the heat dissipating element 11 one by one, but by fixing with the pressing jig 12, the time required for the assembly can be shortened and the cost can be reduced. It has the effect.

(Embodiment 3)
FIG. 6 is a configuration diagram of a projector 20 using the light source element according to the present invention. The projector 20 includes a light source device 10, a light modulation element 21 that modulates light emitted from the light source device according to image data, and a projection unit 22 that projects light modulated by the light modulation element 21.

  As described above, according to the projector 20 according to the present embodiment, the following effects can be obtained in addition to the effects of the first and second embodiments.

  Since a projector using an inexpensive light source device can be configured, an inexpensive projector can be provided.

(Modification 1)
In Embodiment 1 described above, the lens stay 3 has been described as being fixed to the cylindrical portion 202b of the cap portion 202 by the UV adhesive after the position adjustment, but is not limited to this configuration.
The lens stay 3 may be fixed to the eyelet part 201.

(Modification 2)
In Embodiment 1 described above, the lens stay 3 has been described as being fixed to the cylindrical portion 202b of the cap portion 202 by the UV adhesive after the position adjustment, but is not limited to this configuration.
The lens stay 3 may be fixed to both the eyelet part 201 and the cylinder part 202b.

(Modification 3)
In Embodiment 1 described above, the lens stay 3 has been described as being fixed to the cylindrical portion 202b of the cap portion 202 by the UV adhesive after the position adjustment, but is not limited to this configuration.
For fixing, an anaerobic adhesive or a thermosetting adhesive may be used.

  DESCRIPTION OF SYMBOLS 1 ... Light source element, 2 ... Housing | casing, 2a ... Exposed part, 201 ... Eyelet part, 202 ... Cap part, 202a ... Opening part, 202b ... Cylindrical part, 3 ... Lens stay, 3a ... Region, 4 ... Collimator lens, DESCRIPTION OF SYMBOLS 5 ... LD, 10 ... Light source device, 11 ... Radiation element, 12 ... Pressing jig, 20 ... Projector, 21 ... Light modulation element, 22 ... Projection part.

Claims (4)

A solid state light emitting device;
A housing including a light emitting unit that houses the solid-state light-emitting element and extracts light emitted from the solid-state light-emitting element to the outside;
A collimator lens for making the light emitted from the solid state light emitting device substantially parallel;
A holding portion for holding the collimator lens,
The light source element, wherein the holding portion is fixed to the housing, and a part of the housing is exposed from the holding portion when viewed from a light emitting direction. The light source element according to claim 1,
The light source element, wherein the holding portion is made of a material that transmits ultraviolet rays, and the holding portion is fixed to the casing with an ultraviolet curable resin.   A light source device comprising the light source element according to claim 1 attached to a plurality of heat dissipating elements. A light source device in which the light source element according to claim 1 or 2 is pressed against and fixed to a heat dissipating element;
A light modulation element that modulates light emitted from the light source device according to image data;
A projection unit for projecting light modulated by the light modulation element;
A projector characterized by comprising:

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