JP4298137B2 - Light guide light source optical axis adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a light source for adjusting the light emitted from the lamp of the light source to be reflected and collected by a reflecting mirror so that the light of the light source is collected at the incident end surface when entering the incident end surface of the light guide. The present invention relates to an optical axis adjusting device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known an illuminating device using a light guide in which a light source is arranged at a location away from an illumination position and light from the light source is guided by a light guide and used for illumination or the like. In general, such an illuminating device using a light guide has a structure in which light emitted from a lamp of a light source is reflected and collected by a reflecting mirror such as a spheroid, and the reflected light is incident on an incident end face of the light guide. It has become.
[0003]
In order to maximize the light output emitted from the exit end face of this light guide, the light emitted from the lamp of the light source is reflected and collected by the reflecting mirror, and the light is emitted when entering the entrance end face of the light guide. It is necessary to collect light accurately on the incident end face of the guide. In a conventional lighting device using a light guide, the light source is generally held by a so-called spring-type holder. For this reason, the optical axis adjustment is not performed on the light source side, but is performed only by adjusting the position on the light guide side and only in the optical axis direction, and not adjusting the position in the radial direction with respect to the optical axis line. In addition, as described above, the light source is held by a spring-type holder, but this holder has a limit in holding force because of the structure that holds the glass reflector of the light source. The holding position of the light source may be shifted due to vibration or impact during transportation.
[0004]
For the above reasons, the light from the light source is often not accurately collected on the incident end face of the light guide, and therefore the light output emitted from the light guide is lower than the amount of light from the light source. Therefore, to maintain the light output emitted from the light guide so far, the capacity of the light source is increased so that the condensing position in the radial direction with respect to the optical axis may be shifted to some extent from the center of the incident end face of the light guide. Or by increasing the diameter of the light guide. However, they have drawbacks such as increased running costs due to increased power, increased product costs, and increased device size.
[0005]
[Problems to be solved by the invention]
In view of the disadvantages of the prior art, the object of the present invention is to adjust not only the optical axis direction but also the optical axis direction in order to focus the light from the light source on the light guide incident end face more accurately. In contrast, it is possible to adjust in the radial direction, and to eliminate the positional deviation of the light source due to vibration and impact during transportation and transportation.
[0006]
[Means for Solving the Problems]
According to the present invention, a socket for mounting a light source is fixed by a pressing plate from above and below according to the present invention, and this socket is held between these pressing plates so as to be adjustable in the optical axis direction and in the horizontal direction with respect to the optical axis line, and These presser plates are supported by a vertical adjustment shaft that can be adjusted in the vertical direction with respect to the optical axis, and further, the light source is elastically held by sandwiching both sides of the base of the light source by leaf springs. The
[0007]
In a lamp of a light source provided with a reflecting mirror such as a spheroid, light emitted from a light emitting body of the lamp located at the first focal point is reflected by the reflecting mirror and collected at the second focal point. The intensity distribution of the light collected at this time is attenuated by being separated in the optical axis direction from the second focal point and in the radial direction with respect to the optical axis line by the condensing method using the spheroid. Further, since the light emitter of this lamp is not a point light source but has a certain size, the light condensed at the second focal point has a certain size spread.
[0008]
Therefore, the light emitted from the lamp of the light source is reflected and collected by the reflecting mirror, and the optical axis of the light incident on the incident end face of the light guide is shifted in the radial direction from the center of the light guide incident end face with respect to the optical axis. And the condensed light having a certain size spread out of the effective cross-sectional area of the incident end face, and a part of the light is not incident on the light guide incident end face, thereby reducing the light incident efficiency. Become.
[0009]
In a conventional lighting device using a light guide, the light source is held by a spring-type holder, and this holder holds the glass reflector of the light source. It was not done. Therefore, the present invention solves the above problem by focusing on a heat-resistant ceramic socket having a strength for mounting a light source and firmly fixing the socket, and having an adjustable structure at the fixing portion. This socket is made of heat-resistant ceramic and has strength against fixing by a presser plate from the vertical direction.
[0010]
When the socket is fixed, the socket is adjusted between the press plates in the optical axis direction and in the left-right direction with respect to the optical axis line. These presser plates are adjusted in the vertical direction by a vertical adjustment shaft that can be adjusted in the vertical direction with respect to the optical axis. By adjusting both of these, the optical axis is adjusted so that the light from this light source is accurately condensed at the incident end face. This optical axis adjustment is performed by visually observing the light condensing on the incident end face of the light guide. Further, the light source is elastically held by sandwiching both side portions of the base of the light source with leaf springs. As a result, the light source is prevented from being displaced from the optical axis adjustment position due to the vibration and shock after the above adjustment.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of an optical axis adjusting device for a light guide light source according to an embodiment of the present invention, and FIG. 2 is a top view thereof. The light source 25 includes a lamp 1 having a light emitter 2 disposed therein, a reflecting mirror 3, a base 4 and a terminal 11. In the present embodiment, the two terminals 11 are attached to the socket 5. A wiring 6 extends from the socket 5 and is electrically connected to a control device for the light source, a power source and the like (not shown).
[0012]
A light guide 9 is arranged in the optical axis direction 22 in front of the light source 25, and the light guide 9 is inserted into a light guide socket 8 fixed to the case 7 and fixed with screws (not shown). The fixed position of the light guide incident end face 10 of the light guide 9 in the optical axis direction is positioned by, for example, abutting, and this position is set within the range of the subsequent optical axis adjustment. The case 7 is covered with a case cover 12.
[0013]
FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 1. The holding plate 14 has a rubber plate 13 inserted between them and the socket 5 is sandwiched between the holding plate 14 and the vertical adjusting shaft 15 on both sides of the upper and lower holding plates 14. The socket 5 is fixed by the lower fixing nut 16 and the adjusting nut 17 provided. The socket 5 can be adjusted between the presser plates 14 in the optical axis direction 22 and the horizontal direction 23 with respect to the optical axis.
[0014]
A mounting base 18 is fixed to the bottom of the case 7, and a stat 19 is mounted thereon. The vertical adjustment shaft 15 is inserted into the stat 19 so that the vertical adjustment shaft 15 can be adjusted in the vertical direction.
[0015]
FIG. 4 is a cross-sectional view taken along the line B-B ′ of FIG. 1, and the leaf spring 21 holds the base 4 of the light source from both sides. As can be seen from the drawing, the base 4 of the light source is slidable in the vertical direction and the front-rear direction with respect to the optical axis direction between the leaf springs. This clamping force is about 4 kg in the present embodiment, and prevents displacement due to vibration and impact during transportation and transportation. The clamping also has a function of holding the light source when the apparatus is assembled, particularly when the presser plate 14 is loosened when adjusting the optical axis of the light source. The leaf spring 21 has an appropriate elastic force in the left-right direction within the range of the optical axis adjustment at the mounting plate portion, and a fixing position is adjusted by a leaf spring fixing screw 26 as necessary.
[0016]
To adjust the optical axis in the left-right direction 23 with respect to the optical axis direction 22 in FIG. 1 and the optical axis line in FIG. 2, the adjustment nut 17 on the upper side of the holding plate 14 for fixing the socket 5 is loosened appropriately to adjust the socket 5. After the adjustment, it is fixed with the adjustment nut 17. The optical axis adjustment in the vertical direction 24 with respect to the optical axis line is performed by appropriately loosening the vertical adjustment screw 20 and adjusting the vertical adjustment shaft 15 in the vertical direction, and similarly fixed by the vertical adjustment screw 20 after the adjustment. Each adjustment is repeated as necessary.
[0017]
In this optical axis adjustment, the light is focused on the incident end face of the light guide by visual observation. As another method, an electric light quantity measuring device or the like can be used at the light guide incident position or emission position.
[0018]
【The invention's effect】
According to the present invention, the optical axis adjustment for condensing the light of the light source more accurately on the light guide incident end face can be adjusted not only in the optical axis direction but also in the radial direction with respect to the optical axis direction, and can be transported. The positional deviation of the light source due to vibration and impact during transportation can be eliminated, and the running cost, product cost and apparatus size can be reduced. For example, in the present embodiment, a product that previously required a 300 W xenon lamp can obtain a light output emitted from a light guide equivalent or higher by a 50 W metal halide lamp.
[Brief description of the drawings]
FIG. 1 is a side view of an optical axis adjustment device for a light guide light source according to an embodiment of the present invention.
2 is a top view of the optical axis adjusting device of the light guide light source of FIG. 1. FIG.
FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG.
4 is a cross-sectional view taken along the line BB ′ of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lamp 2 Light emitter 3 Reflector 4 Base 5 Socket 6 Wiring 7 Case 8 Light guide socket 9 Light guide 10 Light guide entrance end surface 11 Terminal 12 Case cover 13 Rubber plate 14 Press plate 15 Vertical adjustment shaft 16 Lower side fixing nut 17 Adjustment Nut 18 Mounting base 19 Stat 20 Vertical adjustment screw 21 Leaf spring 22 Optical axis direction 23 Horizontal direction 24 relative to optical axis 24 Vertical direction relative to optical axis 25 Light source 26 Leaf spring fixing screw

Claims (1)

An optical axis adjustment device for a light source for adjusting the light emitted from the lamp of the light source to be reflected and collected by a reflecting mirror so that the light from the light source is collected at the incident end surface when entering the incident end surface of the light guide. , The socket (5) to which the light source (25) is mounted is fixed by the presser plate (14) from above and below, and the socket (5) is interposed between the presser plates (14) in the optical axis direction (22) and The holding plate (14) is supported by an up / down adjustment shaft (15) that can be adjusted in the left / right direction (23) with respect to the optical axis, and can be adjusted in the up / down direction (24) with respect to the optical axis, An optical axis adjusting device for a light guide light source characterized in that the light source (25) is elastically held by sandwiching both side portions of the base (4) of the light source (25) by a leaf spring (21).

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