CN2371575Y

CN2371575Y - Improved camera automatic focusing mechanism

Info

Publication number: CN2371575Y
Application number: CN 99203815
Authority: CN
Inventors: 黄有福; 林忠兴
Original assignee: XINPU PRECISION OPTICS CO Ltd
Current assignee: Xinhong Science and Technology Co., Ltd.
Priority date: 1999-03-04
Filing date: 1999-03-04
Publication date: 2000-03-29
Anticipated expiration: 2009-03-04

Abstract

The utility model relates to an improved camera automatic focusing mechanism, which comprises a distance measuring lens, an emitter, a receiver, a central processing device and a voltage comparator, wherein, the distance measuring lens is corresponding to the front end surface of the front of the lens and is in a wave shape, and more than two arc reflecting end surfaces which are respectively independent of each other are formed and arranged. After the emitter sends out an ultrared ray to measure distance from the back side of the distance measuring lens and a light source enters the distance measuring lens, the single distance measuring light source can naturally form more than two ejaculation light sources and the two ejaculation light sources directly reach an object which is shot because of the action of a plurality of reflecting end surfaces so that an optimum shooting distance is selected to accomplish focusing operation.

Description

Improved camera autofocus mechanism

The utility model system is relevant with a kind of autofocus mechanism of camera, more detailed it, mean a kind ofly when camera is taken especially, can obtain several signals of finding range simultaneously, with the position of correct judgement subject.

The inside of all automatic cameras all is equipped with autofocus mechanism, uses Auto-Sensing and learns the distance of subject and automatically adjust aperture, thereby obtain best shooting effect.

Yet, as shown in Figure 3, the camera autofocus mechanism of commonly using at present mainly is by a range finding eyeglass 10, one transmitter 11, one receiver 12, one central processing unit (not being shown in figure) and voltage comparator assemblies such as (not being shown in figure) constitute an electric loop, only after its transmitter 11 sends infrared distance measuring light source 13 by range finding eyeglass 10 rears and enters the eyeglass 10 of finding range, this light source 13 will be launched ejaculation light source 14 also through subjects 15 one again by range finding eyeglass 10 front end faces, and this single ejaculation light source 14 is incited somebody to action reflected back receiver 12 again after being incident upon subject, multiple behind central processing unit and this signal of voltage comparator interpretation, just finish so-called automatic focusing operation.

Though the use-pattern of this mechanism and principle of operation are all very simple and easy; yet but regular meeting takes place to focus inaccurate and causes the not good puzzlement of shooting effect; trace it to its cause main system because it only can launch single ejaculation light source 14 with as the range finding standard; therefore; if this ejaculation light source 14 be not directly touch subject 15 (if any foreign matter be blocked in before the subject 15, maybe this ejaculation light source 14 by chance is incident upon on the scenery at rear through the side of subject 15); the scenery that then must cause institute's desire to take is fuzzy, and the bad phenomenon generation clearly of prospect or background.

The purpose of this utility model provides a kind of camera when taking, and its autofocus mechanism can be launched the above ejaculation light source in two roads simultaneously, thereby is convenient to choose the shooting effect that best focusing position obtains expection.

The utility model provides a kind of improved camera autofocus mechanism, this system of mechanism is assembled in the camera lens upper interior, comprise a range finding eyeglass, a transmitter, a receiver, a central processing unit and a voltage comparator, its architectural feature is: this range finding eyeglass is wavy with respect to the front end face in camera lens the place ahead system, makes it to form to have more than two and arc reflection end face independently separately.After above-mentioned transmitter was sent the infrared distance measuring light source and entered the range finding eyeglass by range finding eyeglass rear, this single range finding light source formed above ejaculation light source in two roads and through subject; Above-mentioned reflection signal is selected the benchmark of nearest detecting distance as focusing for use.

Further understand technological means of the present utility model and architectural feature in depth for making, cooperate the graphic back that is specified in now:

Fig. 1 is an assembling position schematic perspective view of the present utility model.

Fig. 2 is the structure of the utility model one preferred embodiment and the rough schematic that the range finding light source penetrates the path thereof.

Fig. 3 is a rough schematic of commonly using camera autofocus mechanism and range finding light source ejaculation path thereof.

As shown in Figure 1, 2, rough schematic for assembling position of the present utility model and its range finding light source ejaculation path of a preferred embodiment, as seen from the figure, this autofocus mechanism system is assembled in the appropriate position of camera 20 camera lenses 22 upper interior, and it mainly also is to constitute an electric loop with a range finding eyeglass 30, a transmitter 40, a receiver 50, a central processing unit (not being shown in figure) and voltage comparator assemblies such as (not being shown in figure), precisely because be characterised in that:

This range finding eyeglass 30 is to be wavy with respect to the front end face 31 in camera lens 22 the place aheads, make it to form and have more than two and arc reflection end face 32 independently separately, after transmitter 40 sends infrared distance measuring light source 42 by range finding eyeglass 30 rears and enters range finding eyeglass 30, this single range finding light source 42 will form ejaculation light source 44 and the through subject 60 more than two roads naturally because of the effect of this number reflection end face 32, and penetrate and incite somebody to action all reflected back receiver 50 again after light source 44 is incident upon subject 60, multiple through central processing unit and these signals of voltage comparator interpretation, and the shooting distance of choosing a best is to finish automatic focusing operation.

Because when the shooting operation of carrying out camera 20, usually all can get rid of the foreign matter in subject 60 the place aheads, or manage to allow subject 60 enter camera lens 22 central authorities, therefore, choosing of aforementioned reflection signal is that to select nearest detecting distance for use with the order central processing unit be the best as the focusing benchmark.

The improvement design that the utility model is done at range finding eyeglass 30, make it to detect synchronously the tram and the distance of subject 60 with more ejaculation light source 44, so it must obtain comparatively desirable shooting effect, especially more can provide greatest help for the personage who does not generally have camera shooting experience.

Claims

1, a kind of improved camera autofocus mechanism, this system of mechanism is assembled in the camera lens upper interior, comprises a range finding eyeglass, a transmitter, a receiver, a central processing unit and a voltage comparator, it is characterized in that:

This range finding eyeglass is wavy with respect to the front end face in camera lens the place ahead system, makes it to form to have more than two and arc reflection end face independently separately.

2, improved camera autofocus mechanism according to claim 1, it is characterized in that, after this transmitter was sent the infrared distance measuring light source and entered the range finding eyeglass by range finding eyeglass rear, this single range finding light source formed above ejaculation light source in two roads and through subject.

3, improved camera autofocus mechanism according to claim 1 and 2 is characterized in that, the reflection signal is selected the benchmark of nearest detecting distance as focusing for use.