JPH0668208U - Variable light distribution vehicle lighting - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is simple and robust, and the light distribution pattern of the irradiation light flux is accurately controlled. [Structure] A reflector 1 provided with a lighting bulb 4 is fixed to the rear end of a cylindrical main frame 2 to collimate the light flux after passing through a collimator lens 5. The movable lens 17 inserted in the main frame 2 is inserted into the guide groove hole 7 of the main frame 2 and the helicoid groove hole 10 of the outer cylinder 8 to guide the guide roller 1.
6 is supported by a helicoid type lens driving mechanism 13 which is inserted, and the outer cylinder 8 is rotated by a motor 11 to relatively displace the rotation angle. With respect to the fixed lens 18 fixed to the front end of the main frame 2, the position of the moving lens 17 is axially displaced by the helicoid type lens driving mechanism 13, and the forward irradiation light flux is condensed or diffused.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lighting fixture for a vehicle, such as an automobile, which can control an irradiation light flux to be “focused”, “medium diffused” or “diffused”, and particularly to a variable light distribution vehicle lighting useful as a three-mode fog lamp. It is a thing.

[0002]

[Prior art]

 Conventionally, variable light distribution type lighting fixtures with various structures that can change the light distribution pattern of the irradiation light flux by changing the arrangement of multiple lenses arranged in front of the lighting bulb have been used, but the structure is complicated. In that case, there was a problem such as rattling and a problem. In particular, vehicular lamps such as fog lamps require accurate light distribution control and at the same time robustness in view of usage conditions, and it has been desired to develop a variable light distribution vehicle lamp with a simple structure.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems, and can have a simple structure and a robust structure, and the light distribution pattern of the irradiation light beam can be set to “concentration”, “medium diffusion” or The object of the present invention is to provide a variable light distribution type vehicular lamp equipped with a lens driving mechanism having a novel structure that can be accurately controlled to a “diffused” state.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, a variable light distribution type vehicular lamp according to the present invention uses a lens arranged in front of an optical axis of a reflector provided with a bulb for lighting at a rear end of a cylindrical main frame to form a parallel light beam. The main body of the main frame is fixed while the movable lens, which is inserted in the main frame so as to be slidable in the axial direction, is pivotally mounted via a helicoid type lens drive mechanism. A fixed lens is fixedly provided at the front end portion, and the helicoid type lens driving mechanism is configured to axially shift the position of the moving lens so as to condense or diffuse the forward irradiation light beam. The helicoid-type lens driving mechanism includes an axially extending guide groove hole formed in a cylinder wall of a main frame and an outer cylinder rotatably inserted with respect to the main frame. While Nuki挿 guide roller helicoid groove extending bore drilled the circumferential direction, the outer cylinder is rotated by a motor, which is constituted so as to relatively displace the rotation angle with respect to the main frame.

[0005]

[Action]

 According to the above configuration, when the motor is rotated, the outer cylinder rotates in the circumferential direction with respect to the main frame, and the intersecting position of the guide groove hole of the main frame and the helicoid groove hole of the outer cylinder is axially displaced. For this reason, the guide roller projecting from the movable lens and penetrating both groove holes is displaced in the axial direction to displace the movable lens in the direction in which it is in contact with the fixed lens.

The focal position relationship between the fixed lens and the moving lens and the light flux (parallel light flux) incident on the moving lens are set in advance, and the light flux after passing through the moving lens and the fixed lens is diffused from the condensing light. The light distribution pattern of the irradiation light flux can be changed to "condensing" and "medium diffusion" by controlling the rotation of the motor and stopping the outer cylinder at multiple preset rotational displacement positions. , It can be accurately changed to the three patterns of "diffusion".

[0007]

【Example】

 Hereinafter, a preferred embodiment of a variable light distribution type vehicular lamp according to the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of the lamp, and FIG. 2 is an exploded perspective view of the same. In the present invention, the lamp body has the opening end of the reflector 1 fixed to the flange 3 fixed to the rear end of the cylindrical main frame 2, and the optical axis L of the elliptical reflecting mirror surface 1a of the reflector 1 is fixed to the main frame. It is configured such that it coincides with the cylindrical axis of No. 2 and a lighting bulb 4 is fixedly installed at its first focal position through a bulb socket (not shown).

A lens collar 6 ring-attached to the collimator lens 5 is attached to the middle part of the main frame 2 so that the second focal position of the elliptical reflecting mirror surface 1 a of the reflector 1 and the focal position of the collimator lens 5 coincide with each other. In addition to being fixed by insertion, a pair of guide groove holes 7, 7 extending in the optical axis L direction are formed in the cylindrical wall near the front end at 180-degree symmetrical positions.

Further, an outer cylinder 8 having a ring gear 9 fixed to the outer periphery of the rear end is externally inserted into the main frame 2 so as to be rotatable in the circumferential direction, and a pair of helicopters drilled near the front end of the outer cylinder 8. The guide slots 7, 10 and the guide slots 7, 7 are arranged so as to intersect with each other. Reference numeral 11 denotes a controllable motor fixedly mounted on the flange. The rotation shaft of the motor 11 meshes with the ring gear 9 of the outer cylinder 8 via a rotation transmission mechanism 12 that meshes with a plurality of gears. The outer cylinder 8 is rotationally displaced by the driving of the above, and the helicoid lens drive mechanism 13 is configured to be displaced at the intersection position of the helicoid groove holes 10 and 10 and the guide groove holes 7 and 7.

Reference numeral 14 is a slide cylinder that is inserted into the main frame 2 so as to be slidable in the axial direction. The pair of projecting shafts 15 and 15 projecting on the outer periphery of the 180-degree position have the helicoid groove holes. A helicoid structure is constructed by rotatably arranging guide rollers 16 penetrating the guide groove 10 and the guide groove 7 so as to be slidable in the groove direction. A moving lens 17 having a large number of cylindrical lens steps 17a, 17a arranged side by side in the lateral direction is fixedly mounted on the slide cylinder 14, and is moved and displaced in the optical axis L direction by a helicoid type lens driving mechanism 13. It is configured as follows.

Reference numeral 18 denotes a fixed lens fixed to the front end of the main frame 2 via a lens frame 19, and the fixed lens 18 has a large number of cylindrical lens steps 18 a having the same pitch as the movable lens 17. , 18a ...

Reference numeral 20 in the drawing denotes a shade fixedly provided on the inner wall of the main frame 2 between the collimator lens 5 and the lighting bulb 4, and blocks a part of the light flux to control the shape of the light distribution. To do.

In the variable light distribution type vehicular lamp having the above-described configuration, the motor 11 is rotationally controlled by a controller (not shown), and the irradiation light flux is changed to a “focused”, “medium diffused”, or “diffused” state. You can That is, when the motor 11 is rotated, the outer cylinder 8 rotates (arrow A) via the gear of the rotation transmission mechanism 12 and the ring gear 9, and the guide groove hole 7 of the main frame 2 and the helicoid groove hole of the outer cylinder 8 are rotated. The intersection position of 10 is displaced in the axial direction (arrow B).

However, since the guide roller 16 protruding from the slide cylinder 14 to which the moving lens 17 is attached is inserted at the intersection of the guide groove hole 7 and the helicoid groove hole 10, the guide roller 16 is inserted. Through this, the movable lens 17 is displaced in the direction of the arrow B, and is displaced in the direction in which it comes in contact with and separates from the fixed lens 18.

The light flux from the bulb 4 reflected by the elliptical reflecting mirror surface 1 a of the reflector 1 is displaced by the moving lens 17 because the bulb is at the first focal position and the collimator lens 5 is at the second focal position. However, it becomes a parallel light beam and enters the moving lens 17. Therefore, depending on the relationship between the focal position of the lens step 18a of the fixed lens 18 and the focal position of the lens step 17a of the moving lens 17, the light flux transmitted through both lens steps 17a and 18a will be "diffused" or "focused". .

[0016]

[Effect of device]

 The variable light distribution vehicle lamp according to the present invention is a helicoid-type lens driving mechanism in which the outer cylinder is externally inserted into the cylindrical main frame as described above, so that the structure is simple and the structure is robust. can do. In addition, the moving lens is displaced in the optical axis direction by the helicoid mechanism to change the light distribution pattern of the irradiation light beam to “condensing”, “medium diffusion”, and “divergence”. It has a feature that it can be changed accurately to the pattern state, and the effect obtained by implementing the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lamp according to an embodiment of a variable light distribution vehicle lamp according to the present invention.

FIG. 2 is an exploded perspective view of the lamp.

[Explanation of symbols]

 1 reflector 2 main frame 4 valve 5 collimator lens 7 guide groove hole 8 outer cylinder 9 ring gear 10 helicoid groove hole 11 motor 13 helicoid lens driving mechanism 14 slide cylinder 16 guide roller 17 moving lens 18 fixed lens

Claims (2)

[Scope of utility model registration request] 1. A lamp main body is provided at a rear end of a cylindrical main frame, the lamp main body being adapted to irradiate a parallel light flux by a lens arranged in front of an optical axis of a reflector provided with a lighting bulb, and the main body is also provided. A movable lens, which is slidably inserted in the axial direction with respect to the frame, is pivotally provided through a helicoid type lens drive mechanism, and a fixed lens is fixedly provided at the front end of the main frame. A variable light distribution type vehicular lamp, characterized in that a moving lens position is axially displaced by a mechanism to condense or diffuse a front irradiation light beam. 2. The helicoid-type lens driving mechanism is provided in an axially extending guide groove hole formed in a cylinder wall of the main frame and an outer cylinder rotatably inserted into the main frame. 7. A guide roller is inserted into the circumferentially extending helicoid groove hole, and the outer cylinder is rotated by a motor to relatively displace the rotation angle with respect to the main frame. 1 light distribution variable type vehicle lamp.