JPH0620249Y2 - Filter device for light color change - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a filter device for changing a light color used in lighting equipment and the like.

[Prior Art] In the filter device disclosed in Japanese Unexamined Patent Publication No. 61-156237, a filter section composed of 6-color filters is provided on the light source optical path of the subject illumination, and each filter has four blades and is provided in the optical path. The filter area is made variable by entering and retracting in synchronization. The four filter blades are attached at their base ends to the rotating ring by means of pivot pins, and the driven pins provided at the leading end engage with elongated guide grooves provided on a fixed disk concentric with the rotating ring. By continuously changing the amount of rotation of the rotating ring, the filter area changes continuously.

[Problems to be Solved by the Invention] In this conventional filter device, in order to continuously and variously change the light color, each filter composed of four blades is controlled individually by the rotation amount of each rotary ring. Since it is necessary to advance and retreat sequentially in the optical path, the operation mechanism becomes complicated.

Therefore, it is an object of the present invention to provide a filter device capable of continuously and variably changing a light color with a simple operation mechanism.

[Means for Solving the Problems] The light color changing filter according to the present invention will be described below with reference to the reference numerals in the accompanying drawings. The three spiral sections 7, 8 and 9 having the same shape are used as filter centers. On the other hand, the light-transmissive surface is divided into three evenly by arranging them in parallel by shifting the phase by 120 degrees, and the first spiral section 7 is colored red and the second spiral section 8 is colored blue. , The third spiral section 9 is colored green, and the wide spiral section 10 corresponding to two spiral sections of the three spiral sections of the color filter 5 is colored black. It is provided with an unnecessary light blocking mask 4 which is colored or light-impermeable and has a narrow spiral portion 11 corresponding to the remaining one spiral section which is transparent or transparent and which is not necessary with the coloring filter 5. The light blocking masks 4 are concentrically arranged so as to overlap each other, and The filter 5 and the unnecessary light blocking mask 4 are relatively rotated.

[Operation] When one of the unwanted light blocking mask 4 and the coloring filter 5 is rotated in one direction, or both are rotated in opposite directions and the unwanted light blocking mask 4 and the coloring filter 5 are relatively rotated, the unwanted light blocking mask is obtained. When the transparent or transparent spiral portion 11 of 4 rotates and the unnecessary light blocking mask 4 makes one rotation, all the light transmitting surfaces of the three spiral sections 7, 8 and 9 of the colored filter 5 block unnecessary light. The spiral light transmitting portion 11 of the mask 4 is once faced. In this rotation process, the coloring filter 5
The area ratio in which the two adjacent spiral-shaped sections appear in the spiral-shaped transparent portion 11 of the unnecessary light blocking mask 4 sequentially changes. The light color obtained by this also changes in accordance with the change in the area ratio.

[Example] In the illustrated example, the three spiral sections 7, 8, 9 of the coloring filter 5 are formed so that the radius decreases from the outer circumference circle in inverse proportion to the angle, and one spiral section is formed. When 7 is rotated 120 degrees with respect to the center of the coloring filter 5, the spiral section 7 overlaps with another spiral section 8, and the spiral section 7 is moved with respect to the center of the coloring filter 5 by 24 degrees.
When it is rotated by 0 degrees, the spiral section 7 is further
The light transmitting surface of the coloring filter 5 is divided into three so as to overlap with one spiral section 9.

The spiral section 7 is covered with a transparent red cellophane, the spiral section 8 is covered with a transparent blue cellophane, and the spiral section 9 is covered with a transparent green cellophane.

The present embodiment is applied to a lighting fixture for mood lighting in a room, in which the coloring filter 5 and the unnecessary light blocking mask 4 are housed in the cylindrical body portion 13 of the lighting fixture 12, and the top end portion of the hemispherical light emitting portion 3 is included. Is provided with a drive unit 1 such as an electric motor,
The rotating shaft 2 connected to the driving unit 1 is arranged on the axis of the lighting fixture 12, and the unnecessary light blocking mask 4 is fixed to the lower end of the rotating shaft 2 and is provided below the unnecessary light blocking mask 4. The arranged color filter 5 is fixed to the body portion 13, and the white light source 6 is arranged at the bottom of the body portion 13.

When the color changing operation switch 14 of the drive unit 1 is turned on, the rotary shaft 2 rotates and the unnecessary light blocking mask 4 rotates with respect to the coloring filter 5, so that the light color emitted from the light emitting unit 3 changes.

The filter device for changing the light color of the present invention can be used not only for lighting equipment but also for an optical filter for photography and a spectroscopic device, and the driving means for the unnecessary light blocking mask 4 and the coloring filter 5 is also an electric motor. However, the rotation angle can be changed stepwise or continuously by a manual operation.

[Advantages of the Invention] As described above, the light color changing filter device of the present invention has three light-passing surfaces that are uniformed by the three spiral sections 7, 8 and 9 that are out of phase with each other by 120 degrees with respect to the center of the filter. Into three parts, and the spiral section is colored in red, blue and green respectively, and a wide spiral section 10 corresponding to two spiral sections of the color filter 5 is colored black. Or a non-light-transmissive structure, while a narrow spiral portion 11 corresponding to the remaining one spiral-shaped section is composed of an unnecessary light-shielding mask 4 which is transparent or transparent and is concentrically arranged and stacked. Since the combined colored filter 5 and the unnecessary light blocking mask 4 are relatively rotated, the operation mechanism is simplified as compared with a conventional device that individually controls each filter having a structure of four blades, and a simple operation is performed. Continuously changing the light color Can be made.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a lighting fixture using a light color changing filter device according to an embodiment of the present invention, and FIG. 2 is a plan view of a colored filter used in the filter device. FIG. 3 is a plan view of the unnecessary light blocking mask 4 used in the filter device. DESCRIPTION OF SYMBOLS 1 ... Driving part, 2 ... Rotation axis, 3 ... Light emitting part, 4 ... Unnecessary light blocking mask, 5 ... Color filter, 6 ... White light source, 7, 8, 9
... spiral section, 10 ... wide spiral section, 11 ... narrow spiral section, 12 ... lighting fixture, 13 ... body section, 14 ... color change operation switch

Claims (1)

[Scope of utility model registration request] 1. A light-transmissive surface is equally divided into three by arranging three spiral sections 7, 8 and 9 having the same shape in parallel with each other with a phase shift of 120 degrees with respect to the center of the filter.
The first spiral section 7 is colored red and the second spiral section 8
Is colored blue and the third spiral section 9 is colored green, and a wide spiral section 10 corresponding to two spiral sections of the three spiral sections of the color filter 5.
Is colored black or light-impermeable, and is composed of an unnecessary light-shielding mask 4 in which a narrow spiral portion 11 corresponding to the remaining one spiral partition is transparent or transparent, and the centers thereof are aligned. A filter device for changing light color in which the colored filter 5 and the unnecessary light blocking mask 4 which are superposed on each other are relatively rotated.