JP2000047122A - Filter exchanging device for light emission unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the constitution small-sized and to manufacture the device at low cost by constituting an electromechanical driving device as an electromagnet. SOLUTION: A link 3 is equipped with a 1st lever arm 5 and a 2nd lever arm 6, which are coupled with a common shaft 7 in an oscillatory state. The 1st lever arm 5 is driven by the armature 8 of an electromagnet 1 so as to adjust the 1st lever arm 5 on the shaft 7. An end part of the 2nd lever arm 6 which is distant from the shaft 7 drives a filter 2 through a coupling 10 for adjustment along a guide path. The coupling 10 adjusts the relative movement between the end part 9 and filter 2. The filter 2 is adjustable along the length of a guide rod 11, which is advantageously arranged on one side when the guide rod 11 has a sectional shape stopping the filter 2 from rotating on its length axis. The guide rod 11 is advantageous in cost when sectioned circularly and guided by a slit groove 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device filter changing device.

[0002]

U.S. Pat. No. 5,373,546 discloses a filter changer for adjusting at least one adjustable filter provided in the light path of a light emitter via an electromechanical drive and a link. It is known. An electromechanical drive configured as an electric motor operates a rotatable shaft via a direction change drive, which is connected to the end of the arm. The other end of the arm is operated via a first hinge, a splice piece and a second hinge on the filter such that the filter is adjustable along its channel. The filter is returned from the first position to the second position against the force of the spring element and back again to the first position by the force of the spring element. It is also known to provide a plurality of filters, which are selectively introduced into the beam path by means of a common electromechanical drive with each arm.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to improve a filter changing device of the kind described at the outset, to reduce the size of the arrangement and to make it inexpensive to manufacture.

[0004]

This object is achieved according to the invention by an apparatus according to claim 1.

An advantage of the invention is that the electromechanical drive is configured as an electromagnet, which is simple to manufacture and inexpensive. In addition, there is no need for a device for reversing the direction as compared with the prior art. This is because the electromagnet drives the filter through the link.

[0006] In this case, it is particularly advantageous if the link adjusts from the first position to the second position against the force of the spring element via an electromagnet. This is because the electromagnet only needs to be positively switched on to switch the link and thus the filter element to the second position. When the supply of energy is interrupted, the switching of the link and consequently the switching of the filter element to the first position takes place based on the force of the spring element.

[0007] If the operating length of the link is sufficient, it is possible to drive the filter directly, which advantageously eliminates the need for a lever device.

When the operation length of the link is insufficient, the lever device for operating the filter is operated via the electromagnet and the link. Depending on the leverage ratio, a slight operation of the link is sufficient to operate the filter sufficiently.

In order to obtain a sufficient operating length, it is particularly advantageous if the first and second lever arms of the lever device are pivotally mounted on a common shaft. This occurs especially when the direction of adjustment of the link and the direction of adjustment of the filter are at an angle to one another. As a result, the link and the electromagnet can be at an angle of at least about 90 ° with respect to the direction of adjustment of the filter, so that the filter changing device can be made particularly compact. Depending on the configuration of the filter changing device, however, the electromagnets, together with the link and the operating device of the filter, can also be mutually adjusted so that the device assumes an angle of at least about 0 °.

It is particularly advantageous to mount the two filters on an electromechanical drive so that both filters can be introduced alternately into the light path.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS Other advantages and details of the invention will become apparent from the embodiments shown in the drawings, taking into account the following claims. In these figures, FIG. 1 shows a first embodiment of a filter changing device according to the invention, and FIG.
1 shows a filter changer according to the invention with a common electromechanical drive for individual filters.

For the sake of simplicity, the same parts are denoted by the same reference numerals in the drawings. According to the invention, the filter changer comprises an electromechanical drive, which is designed as an electromagnet 1, in particular as a lifting magnet. In addition, the filter changer has a filter 2 which is adjustable in the light path of the light emitter, not shown, and which is connected to the electromagnet 1 via a link 3. Electromagnets are available within the scope of the present invention and the link 3, and thus also the filter 2, is moved from a first position where the filter 2 is not in the light path to a second position where the filter 2 is in the light path. Is switched to.
However, alternatively and to save money,
For example, by controlling the electromagnet 1, the link 3 may be adjusted to the second position, for example, against the force of the spring element, and the control may be stopped to adjust the link 3 to the first position again by the spring force of the spring element 4. Within the framework of the present invention, it is of course possible to push the filter 2 to the first position and adjust it to the second position by spring force.

In the case of the embodiment shown in FIG. 1, the link comprises a first schematically illustrated lever arm 5 and a second lever arm 6 which are pivotable on a common axis 7. Is joined to. The armature 8 of the electromagnet 1 drives the first lever arm 5 to adjust the first lever arm 5 around the axis 7. The end 9 of the second lever arm 6 remote from the axis 7 drives the filter 2 via a coupling 10 for adjustment along the guideway. The coupling 10 serves in this case to regulate the relative movement between the end 9 and the filter 2. The filter 2 is adjustable in this embodiment at least along the length of the guide rod 11. The filter 2 is advantageously arranged on one side when the guide rod 11 has a cross-sectional shape which prevents rotation of the filter 2 about its longitudinal axis. However, the guide rod has a circular cross-sectional shape, and especially the filter 2 facing the guide rod 11.
It is cost-effective to be guided in the slit-shaped groove 13 on the side surface of the groove.

FIG. 1 shows that a plurality of guide rods 11 and a plurality of grooves are provided.
It can be seen that 13 can be provided and they can be attached to each one filter. Within the scope of the present invention, another electromagnet 1 with a link 3 can be provided for each of the other filters 2. However, a filter changer according to FIGS. 2 and 3 is particularly preferred, in which two different filters 2 are assigned to a single, common electromagnet for alternating movement into the light path. ing. The adjustment direction of link 3 and filter 2 is at least about 90 °
Unlike the filter changing device according to FIG. 1, the armature 8 and the adjusting device of the filter 2 shown in FIG. 2 have an angle of at least about 0 °.

From FIG. 2, it can be seen that the armature 8 operates a beam-like link 14 which can swing about another axis 15. On the beam-like link 14 it can be seen that the armature 8 of the electromagnet 1 operates around another axis 15 for its adjustment. Depending on the distance of the operation of the armature 8 on the beam-like link 14 with respect to the other shaft 15, it is possible in particular to adjust the amplitude and thus the adjustment distance of the filter 2. The adjustment distance, however, also occurs in conjunction with the operation of the first and second rod-shaped link elements 16, 17 which respectively operate the associated filter 2 and the end of the beam-shaped link 14. In particular, the first and second second rod-shaped link elements 16, 17 are connected via a pivot 18 to the associated filter 2 and to the beam-like link 14.
Is also coupled. Also in this case, a spring element 4 is provided, so that an operation for switching the filter 2 to the second position and a return operation based on the spring force to the first position are performed.

In the embodiment of the filter exchange device shown in FIG. 3, the electromagnet 1 is arranged adjacent to the side of the filter 2, which is particularly advantageous in terms of construction in terms of miniaturization. ing. Here too, the filter 2 can be adjusted along a guideway, not shown. The filter 2 and the armature 8 of the electromagnet 1 are connected to each other by a link 3 which can be swiveled around the axis 19 of the link, shown only in principle. By operating the electromagnet 1, the filter 2
Is moved from the position shown in the drawing where the filter 2 is present in the light path to the position shown by the broken line where the filter 2 is not present in the light path.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of a filter changing device according to the present invention.

FIG. 2 is a perspective view of a second embodiment of the filter changing device according to the present invention.

FIG. 3 is a perspective view of a third embodiment of the filter changing device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Filter 3 Link 4 Spring element 5 First lever arm 6 Second lever arm 7 Axis 8 Armature 9 End part 10 Coupling 11 Guide rod 12 Side surface 13 Slit-shaped groove 14 Beam-shaped link 15 Other Axis 16 First rod-shaped link element 17 Second rod-shaped link element 18 Swing axis 19 Link axis

Claims (10)

[Claims] At least one filter provided in a light path of a light emitter and adjustable via a link, and an electromagnetic drive for operating a link (3) for adjusting the filter. A light emitting device filter replacement device, wherein the electromagnetic driving device is configured as an electromagnet (1). 2. The device according to claim 1, wherein the link is adjustable from the first position to the second position via an electromagnet against the force of the spring body. 3. The device as claimed in claim 1, wherein the electromagnet operates the filter directly via a link. 4. The device according to claim 1, wherein the electromagnet operates the filter via a link and a lever device. 5. The device according to claim 4, wherein the first and second lever arms of the lever device (5, 6) mounted on a common shaft (7) are pivotable. 6. The device according to claim 5, wherein the adjusting devices of the link (3) and the filter (2) have an angle therebetween. 7. The apparatus of claim 6, wherein the angle is at least about 90 °. 8. The apparatus of claim 6, wherein the angle is at least about 0 °. 9. The device according to claim 1, wherein a plurality of different filters are adjustable via respective electromagnets. 10. The method according to claim 1, wherein the two filters are arranged on a common electromagnet such that the filters can be selectively introduced into an optical path.
Equipment.