WO2009140830A1

WO2009140830A1 - Filter switching device for photographic lens

Info

Publication number: WO2009140830A1
Application number: PCT/CN2008/071421
Authority: WO
Inventors: 张关泳; 涂金汉; 李天舒
Original assignee: 惠州市百宏微动技术工业有限公司
Priority date: 2008-05-23
Filing date: 2008-06-24
Publication date: 2009-11-26
Also published as: CN201210215Y

Abstract

A filter switching device for photographic lens includes a case (10), a movable frame (20), a plurality of filters (241, 242), a plurality of magnet units (231, 232), and a plurality of magnetic power units (121, 122). A window opening (11), a plurality of containment grooves (14), and a plurality of slide rails (13) are formed in the case (10). A plurality of self-locking cutouts (15) are formed in the slide rail (13). The magnetic power units (121,122) are provided in the containment grooves (14). A plurality of filtering window openings (22) and a plurality of convex slide rails (211) are formed in the movable frame (20). A self-locking protrusion (221) is formed in the convex slide rail (211). The filters (241, 242) are provided in the filtering window opening (22). The magnet units (231, 232) are provided on the movable frame (20) and opposite the magnetic power units (121, 122).

Description

Filter switching device for photographic lens

The invention relates to a filter switching device, in particular to a device for switching a filter by using a magnetic field force, which mainly comprises a housing, a moving support frame and a filter self-locking structure, wherein The housing includes a housing window aperture, a magnetic power unit and a sliding rail, and the housing window aperture is defined on the housing, the magnetic power unit and the sliding rail are respectively disposed on the housing; the mobile support The frame is movably disposed on the housing, and includes a moving plate, a plurality of filter window holes, a magnet unit, and a filter, wherein the magnet unit is fixedly disposed on the magnetic power unit relative to the housing On the moving board. Background technique

As we all know, the filter is one of the auxiliary tools used in the photographic lens. Especially for the security monitoring lens that works around the clock, the filter plays an important role in its structural composition with its unique properties. effect.

As far as the principle of general photographic machinery is concerned, daytime cameras use visible light imaging, and invisible light such as infrared rays affects the imaging effect. Therefore, it is necessary to use visible light to pass through, but filters such as infrared rays that cannot pass through are filtered. In the evening, since the visible light is insufficient to meet the imaging conditions, the camera is switched to the infrared imaging function, and it is necessary to remove the filter that originally prevented the infrared rays from passing through.

In order to meet the above requirements, the structure of the conventional filter switching device is as shown in FIG. Mainly include:

A housing 60 has a slide rail 61 with mounting holes 62 for fixing to the camera on both sides, and a light passing window 63 in the middle.

A support frame 70, the support frame 70 is slidable along the slide rail 61 on the housing 60. The support frame 70 has two windows 61. One side window 61 is mounted with a filter (not shown), and the other side window 61 is provided. Install a regular piece of glass (not shown) with a long hole 72 below the support frame

A drive motor 80 is mounted on the underside of the housing 60, and has a connecting rod 81 at its central axis, and the free end of the connecting rod 81 is pivotally connected to the elongated through hole 72 of the support frame 70.

Through the above structure, when the filter is needed during the day, the driving motor 80 drives the connecting rod 81 to rotate, and the connecting rod 81 drives the supporting frame through the long through hole 72 on the supporting frame 70 to be mounted on the supporting frame 70. The filter faces the window 63 of the housing 60 to effect filtering. When no filtering is required at night, the drive motor 80 is reversed, and the glass piece mounted on the support frame 70 is opposed to the window 63 of the housing 60 by the link 81. However, there are still many disadvantages in the switching of the filter using the above-described structure, and the following are respectively described below.

First, as described above, the conventional filter switching device mainly uses the drive motor 80 to realize the filter switching, and the volume of the driving motor is relatively large with respect to the entire filter switching device, so the above The combination means inevitably increases the overall volume of the conventional filter switching device as a whole. The overall bulk is one of the main drawbacks of conventional filter switching devices.

Secondly, as described above, the conventional filter switching device mainly utilizes a drive motor. 80 and with the aid of the relevant mechanical transmission components, the power outputted by the drive motor 80 is converted and transmitted to the filter position to achieve filter switching, and the mechanical power transmission mode must exist in the specific implementation. Power transmission error, which is another disadvantage of conventional filter switching devices.

Again, as described above, the conventional filter switching device does not have any filter self-locking structure. When the filter is switched to a specific position, it cannot be in a stable state, when the whole device is subjected to In the case of an external force impact, the position of the filter is inevitably changed, thereby affecting the overall image formation effect. The absence of a self-locking structure is yet another disadvantage of conventional filter switching devices.

Finally, as mentioned above, in the specific application of the conventional filter switching device, invisible light such as daytime infrared rays will have a bad influence on photography, and occasional glare (passing car lights, etc.) will affect the infrared at night. The effect of imaging, the glass piece in the above structure cannot effectively block visible light at night. This is another disadvantage of the conventional filter switching device. Summary of the invention

The present invention provides a filter switching device for a photographic lens which realizes switching of a filter by the principle of a magnetic field, thereby reducing the volume of the overall switching device, which is the main object of the present invention.

The invention provides a filter switching device for a photographic lens, which realizes switching of a filter by means of a magnetic field principle, thereby improving a conventional mechanical transmission mode and reducing power transmission error, which is the present invention. Another purpose. The invention provides a filter switching device for a photographic lens, wherein a filter self-locking structure is provided, and when the filter completes the switching action, it can stably maintain its unique position, thereby overall The effect of the image is improved, and this is another object of the present invention.

The invention provides a filter switching device for a photographic lens, which can prevent visible light from entering the lens at night, thereby improving the camera quality at night. This is another object of the present invention.

In order to achieve the above object, the technical solution adopted by the present invention is:

A filter switching device for a photographic lens includes a housing, a moving support frame, and a filter self-locking structure, wherein the housing includes a housing window hole, a magnetic power unit, and a sliding track, and the housing window hole Is disposed on the housing such that light on one side of the housing can pass through the housing window aperture, the magnetic power unit and the sliding rail are respectively disposed on the housing, and further, the housing window The hole is opened at an intermediate position of the housing, and the magnetic power unit is disposed at two sides of the window window hole, the magnetic power unit includes a first magnetic unit and a second magnetic unit, and the first magnetic unit And the second magnetic unit has an air-core coil and an iron core, wherein the iron core is inserted into the air-core coil, and the housing further includes a receiving groove, and is convex upward in the receiving groove. a rib is disposed on the rib, the sliding track includes a plurality of slide rails, and a slide rail of the slide rail is sequentially arranged, and the adjacent slide rails are spaced apart from each other. Self-locking off the mouth.

The mobile support frame is movably disposed on the housing, and the mobile support frame is movable relative to the housing, the mobile support frame includes a moving plate, a plurality of filter window holes, and a magnet a unit and a filter, wherein the moving plate is slidably disposed on a sliding track of the housing, and a sliding rail is disposed on the moving plate relative to the sliding track of the housing, and the plurality of filtering windows The hole is formed on the moving plate with respect to the housing window hole of the housing, and the magnet unit is fixedly disposed on the moving plate with respect to the magnetic power unit of the housing. Further, the magnet unit includes a magnetic block and a second magnetic block, the first magnetic block and the second magnetic block are permanent magnets, and the first magnetic block and the second magnetic block are fixedly disposed on the moving plate, and the first a magnetic block is corresponding to the first magnetic unit of the magnetic power unit, and the second magnetic block is corresponding to the second magnetic unit of the magnetic power unit, the filter is disposed at the filter window In the hole, the filter includes an invisible light filter and a visible light filter, wherein the invisible light filter can filter light to prevent invisible light such as infrared rays from transmitting through the visible light filter, and the visible light filter can filter the light. prevent Wherein the visible light transmission, further, to the head ends of the mobile support frame buffers are provided, and the buffer is provided between the mobile support frame to the housing.

The filter self-locking structure is disposed between the housing and the moving support frame, and is composed of a self-locking break of the sliding track of the housing and a boss slide of the moving support frame, when When the moving support frame is in a stationary state relative to the housing, the boss slide rail of the mobile support frame corresponds to the self-locking break of the sliding track of the housing, and is trapped in the self-locking break, so that the mobile support frame The invention is in a fixed connection relationship with the casing, and the self-locking action of the whole of the invention by the filter self-locking structure is realized.

The filter switching device for a photographic lens further includes a baffle disposed on the casing, and the mobile support frame is closed by the baffle and the casing by the baffle The baffle includes a baffle window hole and a locking boss, wherein the baffle window The hole is corresponding to the housing window hole of the housing, and maintains the same longitudinal position as the housing window hole, the locking boss is disposed at the periphery of the baffle, corresponding to the locking boss A block is disposed on the casing, and the baffle is fixedly disposed on the casing by the locking boss and the block.

Further, the filter switching device for a photographic lens of the present invention further includes a power connection plate disposed between the magnetic power unit of the housing and an external power source to implement an external power source and the magnetic power The connection relationship between the units immediately provides the magnetic power unit with a filter switching device that electrically drives the overall photographic lens; finally, the filter switching device for the photographic lens of the present invention further includes a structural mounting hole, the structure Mounting holes are provided in the periphery of the housing to facilitate the attachment of the present invention to other structures.

The present invention has the following advantages: Since the present invention structurally includes a housing, a moving support frame, and a filter self-locking structure, wherein the housing includes a housing window hole, a magnetic power unit, and a sliding rail, and the housing a window hole is defined in the housing, the magnetic power unit and the sliding track are respectively disposed on the housing; the moving support frame is movably disposed on the housing, and includes a moving plate and a plurality of filters The light window hole, the magnet unit and the filter, wherein the magnet unit is fixedly disposed on the moving plate with respect to the magnetic power unit of the housing.

The switching of the present invention is mainly performed by energizing a magnetic power unit of the housing and generating a magnetic field that attracts or repels the intrinsic magnetic field of the magnet unit of the moving support to drive the moving support relative to the housing. Performing a reciprocating motion to change a housing window hole of the housing and a filter window hole of the moving support frame according to a user's needs Corresponding relationship between them, thereby achieving the effect of switching the filter of the mobile support frame.

DRAWINGS

1 is a perspective view of a conventional filter switching device;

2 is a schematic perspective view of the present invention;

Figure 3 is a perspective exploded view of the present invention;

4 is a perspective exploded view of the housing of the present invention;

Figure 5 is a perspective exploded view of the mobile support frame of the present invention;

Figure 6 is a perspective view of the housing of the present invention;

Figure 7 is a bottom plan view of the mobile support frame of the present invention;

Figure 8 is a plan view of the operation of the present invention;

Figure 9 is a schematic cross-sectional view showing the structure of the present invention.

detailed description

(As shown in FIGS. 2 to 8) a filter switching device for a photographic lens includes a housing 10, a moving support frame 20, and a filter self-locking structure 30, wherein (as shown in FIGS. 2 to 4) The housing 10 includes a housing window opening 11, a magnetic power unit 12, and a sliding rail 13 , and the housing window opening 11 is defined on the housing 10 such that the light of the side of the housing 10 can be from the housing window The hole 11 passes through.

The magnetic power unit 12 and the slide rail 13 are respectively disposed on the housing 10.

Further, the housing window hole 11 is opened at an intermediate position of the housing 10, and the magnetic power unit 12 is disposed at two sides of the housing window hole 11, the magnetic power unit 12 includes a first magnetic unit 121. And a second magnetic unit 122, and the first magnetic The unit 121 and the second magnetic unit 122 respectively have an air-core coil 123 and a core 124, wherein the core 124 is inserted into the air-core coil 123.

Moreover, the housing 10 further includes a receiving groove 14 , and a rib 141 is protruded upwardly from the receiving groove 14 , and the sliding rail 13 is disposed on the protruding rib 141 .

The sliding track 13 includes a plurality of slide rails 131, and a slide rail of the slide rail 13

The 131 are sequentially arranged, and the adjacent slide rails 131 are separated by a self-locking fracture 15 therebetween.

(As shown in Figures 2 to 5) The mobile support frame 20 is movably disposed on the housing 10, and the mobile support frame 20 is movable relative to the housing 10.

The moving support frame 20 includes a moving plate 21, a plurality of filter window holes 22, a magnet unit 23, and a filter 24.

The moving plate 21 is slidably disposed on the sliding rail 13 of the casing 10, and a sliding rail 211 is disposed on the sliding plate 13 of the casing 10 on the moving plate 21.

A plurality of the filter window holes 22 are formed on the moving plate 21 with respect to the casing window hole 11 of the casing 10.

The magnet unit 23 is fixedly disposed on the moving plate 21 with respect to the magnetic power unit 12 of the casing 10.

Further, the magnet unit 23 includes a first magnetic block 231 and a second magnetic block 232. The first magnetic block 231 and the second magnetic block 232 are permanent magnets, and the first magnetic block 231 and the second magnetic block. 232 is fixedly disposed on the moving plate 21, and the first magnetic block 231 is corresponding to the first magnetic unit 121 of the magnetic power unit 12, and the second magnetic block 232 is associated with the magnetic power unit 12. The second magnetic unit 122 corresponds to. Further, the first magnetic block 231 and the second magnetic block 232 are mounted on the moving plate 21 in the same magnetic direction.

The filter 24 is disposed in the filter window hole 22, and the filter 24 includes a non-visible light filter 241 and a visible light filter 242, wherein the invisible light filter 241 can filter the light to block the infrared light. The invisible light is transmitted therethrough, and the visible light filter 242 can filter the light to block visible light from passing therethrough.

Further, a buffer 25 is disposed on each of the two ends of the mobile support frame 20, and the buffer 25 is disposed between the mobile support frame 20 and the housing 10.

(As shown in FIGS. 3 to 9) The filter self-locking structure 30 is disposed between the housing 10 and the moving support frame 20, which is a self-locking break 15 of the slide rail 13 of the housing 10. And the boss slide 21 1 of the mobile support frame 20, when the mobile support frame 20 is in a stationary state relative to the housing 10, the boss slide rail 211 of the mobile support frame 20 and the housing 10 The self-locking break 15 of the sliding track 13 corresponds to the self-locking break 15 and keeps the mobile support frame 20 in a fixed connection relationship with the casing 10, thereby realizing the whole of the present invention by the filter self-locking structure 30. Perform a self-locking action.

When the moving support frame 20 moves on the sliding track 13 of the casing 10 to perform the switching operation of the filter 24, the magnetic power unit 12 of the casing 10 is energized and generates a magnetic field, and the magnetic field and the moving support The magnetic field inherent to the magnet unit 23 of the frame 20 generates a force to break the state in which the filter self-locking structure 30 is self-locking to the present invention, and the switching operation of the filter 24 is completed.

The filter switching device for a photographic lens of the present invention further includes a baffle 40 disposed on the casing 10, and the baffle 40 is used to The moving support frame 20 is enclosed between the baffle 40 and the housing 10.

The baffle 40 includes a baffle window hole 41 and a locking boss 42, wherein the baffle window hole 41 corresponds to the casing window hole 11 of the casing 10, and the casing window hole 11 Keep the same vertical position.

The locking boss 42 is disposed at the periphery of the baffle 40, and corresponds to the locking boss 42. The housing 10 is provided with a block 16 by means of the locking boss 42 and the block. The baffle 40 is fixedly disposed on the casing 10.

Further, the filter switching device for a photographic lens of the present invention further includes a power connection plate 50 which is disposed between the magnetic power unit 12 of the housing 10 and an external power source. In order to realize the connection relationship between the external power source and the magnetic power unit 12, the magnetic power unit 12 is immediately provided with a filter switching device that electrically drives the entire photographic lens.

The first magnetic unit 121 and the second magnetic unit 122 of the magnetic power unit 12 of the housing 10 are connected in parallel via the power connection plate 50.

Finally, the filter switching device for a photographic lens of the present invention further includes a structural mounting hole 111 which is disposed around the periphery of the housing 111 to facilitate the attachment of the present invention to other structures.

The switching of the present invention is mainly performed by energizing the magnetic power unit 12 of the housing 10 and generating a magnetic field that attracts or repels the intrinsic magnetic field of the magnet unit 23 of the moving support frame 20 to drive the moving support frame 20. Reciprocating motion relative to the housing 10 to change the correspondence between the housing window aperture 11 of the housing 10 and the filter window aperture 22 of the mobile support frame 20 according to the needs of the user, thereby achieving Switch the move The purpose of the filter 24 of the support frame 20.

For example, when the first magnetic block 231 and the second magnetic block 232 of the mobile support frame 20 are N poles downward, the magnetic field thereof is perpendicular to the sliding track 13 of the housing 10, and the magnetic power unit 12 of the housing 10 is energized. A magnetic field is generated parallel to the sliding track 13 and the S pole is on the side of the second magnetic block 232. The two magnetic fields interact, most of the magnetic lines of force coincide, and the moving support frame 20 is attracted to the right side shown in FIG. The invisible light filter 241 of the moving support frame 20 is at a position facing the housing window hole 11 of the housing 10. At this time, the invisible optical filter 241 works to prevent invisible light such as infrared rays from entering the lens without affecting the visible light entering the lens, and the camera is in the daytime working state.

When the input current direction of the magnetic power unit 12 of the casing 10 changes, the magnetic field generated by the magnetic power unit 12 also changes, and the moving support frame 20 will follow the sliding track 13 of the casing 10 under the action of the magnetic field. Moving to the left in FIG. 8, the visible light filter 242 is in a position facing the housing window opening 11 of the housing 10. At this time, the visible light filter 242 works to prevent visible light from entering the lens, and invisible light such as infrared rays can enter the lens, and the camera is in an evening working state.

Claims

A filter switching device for a photographic lens, comprising: a housing, a moving support frame, and a filter self-locking structure, wherein the housing includes a housing window hole, a magnetic power unit, and a sliding track. The housing window aperture is defined in the housing, the magnetic power unit and the sliding rail are respectively disposed on the housing;

The mobile support frame is movably disposed on the housing, and the mobile support frame is movable relative to the housing, the mobile support frame includes a moving plate, a plurality of filter window holes, a magnet unit, and a filter, wherein The moving plate is slidably disposed on the sliding track of the casing, and the sliding track of the moving plate relative to the casing is provided with a boss rail, and the plurality of filtering window holes are opposite to the casing a housing window is defined in the moving plate, the magnet unit is fixedly disposed on the moving plate with respect to the magnetic power unit of the housing, and the filter is disposed in the filtering window hole The filter includes an invisible light filter and a visible light filter. Finally, the filter self-locking structure is disposed between the housing and the movable support.

The filter switching device for a photographic lens according to claim 1, wherein: the housing window opening is opened at an intermediate position of the housing, and the magnetic power unit is disposed in the housing The magnetic power unit includes a first magnetic unit and a second magnetic unit, and the first magnetic unit and the second magnetic unit respectively have an air-core coil and an iron core, wherein the iron core is inserted Located in the air core coil.

The filter switching device for a photographic lens according to claim 1, wherein the housing further comprises a receiving groove, and a convex rib is protruded upwardly in the receiving groove, the sliding track It is disposed on the rib.

4. A filter switching device for a photographic lens according to claim 1, characterized by The sliding track comprises a plurality of sliding rails, and the sliding rails of the sliding rails are sequentially arranged, and the adjacent sliding rails are separated by a self-locking fracture.

The filter switching device for a photographic lens according to claim 1, wherein: the magnet unit of the moving support frame comprises a first magnetic block and a second magnetic block, the first magnetic block and the The second magnetic block is a permanent magnet, and the first magnetic block and the second magnetic block are fixedly disposed on the moving plate, and the first magnetic block is corresponding to the first magnetic unit of the magnetic power unit. And the second magnetic block is corresponding to the second magnetic unit of the magnetic power unit, and then the first magnetic block and the second magnetic block are mounted on the moving plate in the same magnetic direction.

The filter switching device for a photographic lens according to claim 1, wherein: the two ends of the moving support frame are respectively provided with a buffer, and the buffer is disposed on the mobile support frame and Between the shells.

The filter switching device for a photographic lens according to claim 4, wherein the filter self-locking structure is a self-locking fracture of the sliding track of the housing and a convexity of the moving support frame. The slide rails are composed.

The filter switching device for a photographic lens according to claim 1, wherein the filter switching device for the photographic lens further comprises a baffle, the baffle is disposed on the housing And sealing the mobile support frame between the baffle and the casing by using the baffle plate,

The baffle includes a baffle window aperture and a locking boss, wherein the baffle window aperture corresponds to the housing window aperture of the housing and maintains the same longitudinal position as the housing window aperture, The locking boss is disposed at a periphery of the baffle, corresponding to the locking boss, the block is provided with a block, and the baffle is fixed by the locking boss and the block It is disposed on the housing.

9. The filter switching device for a photographic lens according to claim 1, wherein: the filter switching device for the photographic lens further comprises a power connection plate, wherein the power connection plate is disposed on the case The first magnetic unit and the second magnetic unit of the magnetic power unit of the housing and the external magnetic source are connected in parallel through the power connection board.

10. The filter switching device for a photographic lens according to claim 1, wherein: the filter switching device for the photographic lens further comprises a structural mounting hole, wherein the structural mounting hole is disposed in the housing Around the body.