KR200411050Y1 - Light-filtering module for an image-capturing device - Google Patents

Abstract

The optical filtering module for image capture includes a casing 1, a sliding filter unit 3, and an actuator unit 2. The casing 1 is formed with an opening 12 in spatial communication with the slide groove 100. The sliding filter unit 3 has a first position in the slide groove where the first lens element 302 is aligned with the opening 12 and the second lens element 300 is aligned with the opening 12. It includes a lens set 30 slidable between two positions. The actuator unit 2 is connected to the electromagnetic coil set 22 and the sliding filter unit 3 and the magnetic rod portion 242 movably extending toward the armature hole 220 of the electromagnetic coil set 22. Armature unit 24 having a. By applying a current to the electromagnetic coil set 22 and moving the armature unit 23, the lens set 30 can be moved to a selected position between the first position and the second position.

Image, Capture, Light Filtering, Module, Actuator, Electromagnetic Coil, Sliding Filter

Description

Optical filtering module for image capture device {LIGHT-FILTERING MODULE FOR AN IMAGE-CAPTURING DEVICE}

Other features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

1 and 2 are perspective views of a light filtering module for a conventional surveillance camera.

3 is an exploded perspective view of a preferred embodiment of the optical filtering module for an image capture device according to the present invention.

4 and 5 are assembled perspective views of the preferred embodiment.

The present invention relates to a light-filtering module, and more particularly to a light filtering module for an image-capturing device.

Images captured by an image capture device, such as a surveillance camera, will be of poor quality in extreme ambient light conditions, i.e. with too much or too little ambient light. To improve image quality when ambient light is inadequate, you can use auxiliary lighting or night vision technique, but the problem of image quality improvement when capturing images in strong ambient light is still It must be solved.

1 and 2, Taiwan Patent Publication No. 556791 discloses a conventional light filtering module for a surveillance camera. The light filtering module comprises a motor 5 controlled by a light sensing circuit, not shown.

In the case where the ambient light is insufficient, the transparent lens component 10 on the lens holder 8 is not shown to operate the motor 5 to optimize the amount of light incident on the lens unit. Move the lens holder 8 to align with the lens unit of the surveillance camera. On the other hand, when the ambient light is in a strong state, the lens so that the filtering lens element 9 of the lens holder 8 is aligned with the lens unit of the surveillance camera, in order to filter the strong rays to improve the quality of the image captured by the surveillance camera. The holder 8 is moved through a restoring spring mechanism 7.

 However, since the restoring spring mechanism 7 is an unreliable part susceptible to spring fatigue, it cannot guarantee the exact position of any lens element 9, 10 with respect to the lens unit of the surveillance camera. . The motor 5 is also a bulky part, which inevitably entails an increase in the size and cost of the surveillance camera to house the motor 5 therein.

It is therefore an object of the present invention to provide an optical filtering module for an image capture device which can overcome the disadvantages associated with the prior art described above.

According to the present invention, the optical filtering module comprises a casing, a sliding filter unit and an actuator unit.

The casing forms a slide groove and has an aperture in space to communicate with the slide groove.

The sliding filter unit includes a lens set disposed in the slide groove, and an actuator coupling member connected to the lens set and extending outward of the slide groove. The lens set includes a first lens element and a second lens element, one of which is a light filtering lens. The lens set is slidable in the slide groove between a first position where a first lens element is aligned with the opening and a second position where a second lens element is aligned with the opening.

The actuator unit includes an electromagnetic coil set and an armature unit. The electromagnetic coil set is mounted on the casing outside of the slide groove, through which an armature hole is formed. The armature unit includes a magnetic rod portion connected to the actuator connecting member and extending to move toward the armature hole, and a supporting rod extending coaxially from the magnetic rod portion. portion). By moving the armature unit by applying a current to the electromagnetic coil set, the lens set may be moved to a selected position of the first position and the second position of the slide groove.

EXAMPLE

3 and 5, the optical filtering module of the preferred embodiment according to the present invention is shown to be suitable for application to an image capturing device such as a surveillance camera, and includes a casing 1, a sliding filter unit 3, And an actuator unit 2.

The casing 1 forms a slide groove 100 and is formed to have an opening 12 in space with the slide groove 100. The opening 12 can be aligned with the lens unit of the image capture device (not shown).

The sliding filter unit 3 includes a lens set 30 disposed in the slide groove 100 and an actuator connecting member 34 connected to the lens set 30 and extending outward of the slide groove 100. ). Lens set 30 includes a first lens element 302 and a second lens element 300. In this embodiment, the first lens element 302 is an optical filter ring lens and the second lens element 300 is a normal transparent lens. The lens set 30 has a first position in the slide groove where the first lens element 302 aligns with the opening 12, best seen in FIG. 4, and a second lens element, best seen in FIG. 5. 300 is slidable between the second position where the opening 12 is aligned.

The actuator unit 2 comprises an electromagnetic coil set 22 and an armature unit 24. The electromagnetic coil set 22 is mounted on the casing 1 outside of the slide groove 100, and the armature hole ( An armature hole 220 is formed through the armature unit 24. The armature unit 24 is connected to the actuator connecting member 34, and has a magnetic rod portion 242 movably extending toward the armature hole 220, and a magnetic rod portion. And a support rod portion 244 connected to 242 and extending co-axially from the magnetic rod portion 242. Preferably, the magnetic rod portion 242 is a permanent magnet and the support rod portion 244 is made of a non-magnetically attractive material.

In this embodiment, the casing 1 is provided with a coil-mounting seat 14 disposed on the outside of the slide groove 100 on one side. The electromagnetic coil set 22 is held in the coil mounting sheet 14 and is wound around the dielectric winding frame 222 forming the armature hole 220, and the dielectric coil-winding frame 222. A coil 224. The coil mounting sheet 13 is formed with a slot 140 (see FIG. 3) capable of extending end segments A and B of the conductive coil 224. The ends A, B of the coil 224 are suitable for being electrically connected to a light-responsive dirver circuit of an image capture device, not shown. Since the features of the present invention are not in the structure and related functions of the photoreactive driver circuit, specific details thereof are omitted here for the sake of brevity.

The electromagnetic coil set 22 is supplied with a current by the above-described photoreactive driver circuit to move the armature unit 24 to move the lens set 30 to a selected position of the first position and the second position of the slide groove 100. ) Can be moved. In particular, referring to FIG. 5, if the photoreactive driver circuit detects that ambient light is insufficient to capture a suitable image, the magnetic rod portion 242 is directed toward the armature hole 220 with magnetic attraction. To attract, a first-polarity exciting current will be sent to the conductive coil 224 such that a current is applied to the conductive coil 224. As a result, the lens set 30 moves the actuator connecting member 34 so that the second lens element 300 is aligned with the opening 12 in the casing 1 to optimize the amount of light incident on the lens unit of the image capture device. Through to the second position.

On the other hand, as shown in FIG. 4, when the photoreactive driver circuit detects that the ambient light is sufficient to capture a suitable image, the magnetic rod portion 242 is moved to the armature hole 220 by magnetic repulsion. To push it out, it will send an excitation current of a second polarity to the conductive coil 224 such that a current is applied to the conductive coil 224. As a result, the lens set 30 is moved to the first position through the actuator connecting member 34 so as to filter the strong rays to improve the quality of the image captured by the image capturing apparatus, so that the first lens element 300 is moved. It is aligned with the opening 12 in the casing 1.

Compared with the conventional optical filtering module described above, the present invention provides the movement of the lens set 30 in the slide groove 100, the actuator unit 2 including the electromagnetic coil set 22 and the armature unit 24. Can be precisely controlled. In addition, since the actuator unit 2 is compact and compact, it is possible to solve the disadvantage of the related art related to the use of the motor.

Although the present invention has been described in connection with the most practical and preferred embodiments, the present invention is not limited to the disclosed embodiments, and variously encompassed within the spirit and scope of the broadest interpretation so as to encompass the apparatus obviously equivalent to all modifications. It is of course intended to include all of the devices.

Claims (5)

A casing (1) forming a slide groove (100) and having an opening (12) in spatial communication with the slide groove (100); A sliding filter unit 3; And Actuator Unit (2) Including; The sliding filter unit 3, Disposed in the slide groove 100 and comprising a first lens element 302 and a second lens element 300 wherein one of the first lens element 302 and the second lens element 300 is optically filtered A lens set 30 that is a lens, and An actuator connecting member 34 connected to the lens set 30 and extending outward of the slide groove 100. Including, The actuator unit 2, An electromagnetic coil set 22 mounted on the casing 1 from the outside of the slide groove 100 and formed through an armature hole 220, and A magnetic rod portion 242 connected to the actuator connecting member 34 and movably extending toward the armature hole 220, and a support rod extending co-axially from the magnetic rod portion 242. Armature unit 24 with section 244 Including; The lens set 30 has a first position within the slide groove where the first lens element 302 aligns with the opening 12 and the second lens element 300 aligns with the opening 12. Slidable between the second positions, By moving the armature unit 23 by applying current to the electromagnetic coil set 22, the lens set 30 is moved to a selected position of the first position and the second position of the slide groove 100. Characterized in that Optical filtering module. The method of claim 1, The said casing 1 is provided with the coil mounting sheet 14 arrange | positioned at the outer side of the said slide groove 100 in one surface, The electromagnetic coil set (22) is held on the coil mounting sheet (14). The method of claim 2, The electromagnetic coil set 22 includes a dielectric winding frame 222 forming the armature hole 220, and a conductive coil 224 wound around the dielectric winding frame 222, The coil mounting sheet (13) has an optical filtering module, characterized in that it is provided with a slot 140 for extending the end (A, B) of the conductive coil (224). The method of claim 1, The magnetic rod part 242 is a permanent magnet, The support rod portion (244) is a light filtering module, characterized in that made of a non-magnetically attractive material (non-magnetically attractive material). The method of claim 1, And the other of said first lens element (302) and said second lens element (300) is a transparent lens.

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