TWI499822B - A lens with dual focus detection points - Google Patents

Description

Lens with dual focus detection points

The present invention relates to a lens, and more particularly to a lens having a dual focus detection point.

In the past, a lens includes a focusing unit and a zooming unit, wherein a focusing driving component of the focusing unit drives a focusing group frame to move between a telephoto end and a close-up end, and a zoom driving component of the zoom unit drives a zoom group The frame moves between the wide-angle end and the telephoto end. In the past, the focus unit and the zoom unit respectively have a focus detection component and a zoom detection component, respectively, for detecting the focus group frame and the zoom group frame. The zero position, as disclosed in the patent documents No. TW I310848 and No. TW I305603, respectively disclose the detecting elements corresponding to the focusing unit and the zoom unit.

The detection principle of the zoom unit is to provide a reflector on a rotating cylinder, and the detecting component on a fixed cylinder detects whether it is in place.

If the focus unit is in the middle of detection, the number of control steps of the focus drive member does not match the position of the focus group frame due to mechanism interference, and the focus detection component cannot recognize the position change of the focus group frame, and cannot be corrected immediately. Out of step, it will lead to confusion.

Therefore, a lens that can provide full-stroke detection of the focusing unit is one of the research and development targets of current related companies.

Accordingly, it is an object of the present invention to provide a lens having a dual focus detection point that provides full focus detection of the focus unit.

Therefore, the lens having the dual focus detection point of the present invention comprises a base, a lower detecting component, an upper detecting component, and a focusing unit, wherein the lower detecting component is mounted on the base, and the upper detecting component Mounted on the base and located above the lower detecting component, the focusing unit includes a focusing group frame slidably mounted on the base, and a pair of upper and lower detecting components are formed in the focus group frame. a board, and a focus drive mounted on the base and driving the focus group frame to move between a telephoto end and a close-up end.

The effect of the present invention is that if the number of control steps of the focus drive member does not match the position of the focus group frame due to the mechanism interference, the position of the focus group frame can be recognized by the upper and lower detection elements, and the error can be corrected immediately. Steps to achieve full-stroke detection.

The foregoing and other objects, features, and advantages of the invention are set forth in the <RTIgt;

Referring to FIG. 1, a preferred embodiment of a lens having dual focus detection points of the present invention includes a susceptor 1, a lower detecting component 2, an upper detecting component 3, a focusing unit 4, and a zoom unit 5.

The base 1 includes an upright tubular portion 11 and a chassis portion 12 having a plurality of straight grooves 111 (see FIG. 5). The lower detecting member 2 is mounted on the upright tubular portion 11 of the base 1. The upper detecting component 3 is mounted on the upright tubular portion 11 of the base 1 and above the lower detecting component 2. In the preferred embodiment, the lower detecting component 2 and the upper detecting component 3 All are optically transmissive detection components.

The focusing unit 4 includes a focusing group frame 41 slidably mounted on the pedestal 1, a pair of focusing detection boards 42 on which the upper and lower detecting elements 3 and 2 are formed in the focusing group frame 41, and a focusing detection panel 42 The focus drive member 43 is mounted on the base 1 and drives the focus group frame 41 to move between a telephoto end and a close-up end.

With reference to FIG. 4, in the preferred embodiment, the focus detection board 42 is a visor, and the focus drive 43 has a focus motor 431, a screw 432 connected to the focus motor 431, and a screw The screw 432 is pressed against the nut 433 on the focusing group frame 41, a guiding rod 434 fixed to the chassis portion 12 of the base 1 and passing through the focusing group frame 41, and a set of the guiding rod 434. And returning to the return spring 435 between the focus group frame 41 and the base portion 12 of the base 1.

The zoom unit 5 includes a zoom group frame 51 slidably mounted on the upright tubular portion 11 of the base 1 and located above the focus group frame 41, and a zoom of a pair of upper detecting elements 3 formed on the zoom group frame 51. The detecting board 52 and a zoom driving member 53 mounted on the base 1 and driving the zoom group frame 51 to move between a wide-angle end and a telephoto end.

Referring to FIG. 5, in the preferred embodiment, the zoom detecting board 52 is a light blocking plate, and the zoom driving member 53 has a zoom motor 531, a screw 532 connected to the zoom motor 531, and a screw 532. The reduction gear set 533 and a cam barrel 534 that engages the reduction gear set 533 pass through the straight groove 111 of the vertical cylinder portion 11 through the protruding pin 511 of the zoom group frame 51, and are opened on the cam barrel 534. The plurality of cam grooves 535 are engaged to achieve the purpose of driving the zoom group frame 51.

Referring to FIG. 2 and FIG. 3, the upper and lower detecting components 3 and 2 provide three detecting points of the focusing unit 4, that is, the focusing detecting board 42 of the focusing unit 4 can be opposite to the lower detecting component 2 ( 1), relatively between the upper and lower detection elements 3, 2 (as shown in Figure 2), or relative to the upper detection element 3 (as shown in Figure 3), therefore, the focus unit 4 in the middle of detection, if The number of control steps of the focus drive member 43 is inconsistent with the position of the focus group frame 41 due to the interference of the mechanism, and the position change of the focus group frame 41 can be recognized through the upper and lower detection elements 3 and 2, and the out-of-step is corrected instantaneously. In order to avoid the confusion caused by the focus unit 4 deriving detection blur.

In addition, the upper detecting component 3 is shared by the focusing unit 4 and the zooming unit 5, and the upper detecting component 3 provides two detecting points of the zooming unit 5, that is, the zoom detecting board 52 of the zooming unit 5. The upper detecting element 3 (as shown in FIG. 1) or the upper detecting element 3 may be opposite to the upper detecting element 3, and the upper detecting element 3 is shared by the focusing unit 4 and the zoom unit 5, thereby achieving cost-saving effect. For the position determination method of the upper detecting element 3, reference may be made to the contents disclosed in Patent Document No. TW 100123883.

In summary, the focusing unit 4 provides three detection points through the upper and lower detecting components 3 and 2, so that the focusing unit 4 controls the number of control steps of the focusing driving member 43 due to mechanism interference in the middle of detection. When the position of the focus group frame 41 does not match, the position detection of the focus group frame 41 can be recognized by the upper and lower detection elements 3 and 2, and the out-of-step can be corrected instantaneously to avoid the problem of the detection focus blur caused by the focus unit 4. The effect of the full stroke detection is achieved, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1. . . Pedestal

11. . . Straight tube

111. . . Straight into the ditch

12. . . Chassis

2. . . Lower detection component

3. . . Upper detection component

4. . . Focus unit

41. . . Focus group

42. . . Focus detection board

43. . . Focus drive

431. . . Focus motor

432. . . Screw

433. . . Nut

434. . . Guide rod

435. . . Return spring

5. . . Zoom unit

51. . . Zoom group frame

52. . . Zoom detection board

53. . . Zoom drive

531. . . Zoom motor

532. . . Screw

533. . . Reduction gear set

534. . . Cam barrel

535. . . Cam groove

1 is a perspective cross-sectional view showing a preferred embodiment of a lens having dual focus detection points of the present invention;

2 is a perspective cross-sectional view showing a pedestal, a lower detecting component, an upper detecting component, a focusing unit, and a zooming unit of the preferred embodiment, wherein the focus detecting board of the focusing unit is relatively located above and below Detecting between components;

3 is a perspective cross-sectional view showing the focus detecting board of the focusing unit of the preferred embodiment with respect to the upper detecting component;

4 is a partial perspective view showing a focus driving member of the focusing unit of the preferred embodiment; and

Figure 5 is a top plan view showing a zoom driving member of the zoom unit of the preferred embodiment.

1. . . Pedestal

11. . . Straight tube

12. . . Chassis

2. . . Lower detection component

3. . . Upper detection component

4. . . Focus unit

41. . . Focus group

42. . . Focus detection board

5. . . Zoom unit

51. . . Zoom group frame

52. . . Zoom detection board

53. . . Zoom drive

533. . . Reduction gear set

534. . . Cam barrel

535. . . Cam groove

Claims (2)

A lens having a dual focus detection point, comprising: a base; a lower detecting component mounted on the base; an upper detecting component mounted on the base and located above the lower detecting component; a focusing unit includes a focusing group frame slidably mounted on the base, a pair of focusing detection boards on which the upper and lower detecting components are formed on the focusing group frame, and a mounting on the base and driving the focusing unit A focus group that moves between a telephoto end and a close-up end. The lens having the dual focus detection point according to claim 1 further includes a zoom unit, and the zoom unit includes a zoom group frame slidably mounted on the base and located above the focus group frame, A zoom detecting board corresponding to the detecting component formed on the zoom group frame, and a zoom driving member mounted on the base and driving the zoom group frame to move between a wide-angle end and a telephoto end.