CN209767648U

CN209767648U - Full-automatic focusing device

Info

Publication number: CN209767648U
Application number: CN201920716358.2U
Authority: CN
Inventors: 潘爱霞; 李牧; 滕鹏伟
Original assignee: Shanghai New Vision Medical Instrument Ltd By Share Ltd
Current assignee: Shanghai New Vision Medical Instrument Ltd By Share Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2019-12-10
Anticipated expiration: 2029-05-17

Abstract

The utility model relates to the technical field of medical treatment, in particular to a full-automatic focusing device, which comprises a front fixed plate, a rear fixed plate, a motor, a screw rod mechanism and a moving block, wherein the motor, the screw rod mechanism and the moving block are uniformly arranged between the front fixed plate and the rear fixed plate, the motor drives the moving block to do linear reciprocating movement through the screw rod mechanism, two parallel guide rods are fixed between the front fixed plate and the rear fixed plate, a sliding plate is fixed on the moving block, the two guide rods vertically and freely pass through the plate surface of the sliding plate, the sliding plate is driven to move along the two guide rods when the moving block moves, a limit switch is arranged between the front fixed plate and the rear fixed plate, the sliding plate passes above the limit switch during moving, a shielding piece for triggering the limit switch is arranged at the bottom of the sliding plate, a photosensitive element is arranged, thereby driving the photosensitive element to realize reciprocating linear motion and realizing the purposes of quick and accurate focusing.

Description

Full-automatic focusing device

Technical Field

The utility model relates to the field of medical technology, especially, relate to a full automatic focusing device.

Background

At present, most of handheld fundus cameras on the market adopt a manual focusing mode, and some of the handheld fundus cameras adopt a gear structure focusing mode. The efficiency is low, and the clear position can be found only through repeated adjustment of manual focusing, and at the moment, the picture still needs to be taken manually, or the eyes are difficult to keep still, and the deviation is easy to appear in photographing. The gear type focusing mode has the advantages of high installation difficulty, repeated adjustment, high requirement on machining precision, difficulty in eliminating gear gaps, high noise during movement and influence on focusing precision.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defect that above-mentioned prior art exists, provide a precision height, fast and easy operation's full automatic focusing device.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a full automatic focusing device, including the preceding fixed plate, the after-fixing board, including a motor, a controller, and a cover plate, lead screw mechanism and movable block both arrange between preceding fixed plate and after-fixing board, the motor drives the movable block through lead screw mechanism and is straight reciprocating motion, fix the guide bar of two parallels between preceding fixed plate and the after-fixing board, fixed slide on the movable block, two guide bars pass perpendicularly freely in the face of slide, the movable block drives the slide and removes along two guide bars when removing, arrange limit switch between preceding fixed plate and the after-fixing board, slide removal in-process is through limit switch's top, and the bottom of slide is equipped with the shielding piece that triggers.

The front fixing plate and the rear fixing plate are vertically arranged and are parallel to each other.

The limit switch is in a U-shaped groove shape, and when the sliding plate moves, the shielding piece at the bottom of the sliding plate penetrates through the groove of the limit switch.

One of the guide rods close to the motor is sleeved with a spring and a shaft sleeve, one end of the spring is abutted against the front fixing plate, the other end of the spring is abutted against one end part of the shaft sleeve, and the other end part of the shaft sleeve is fixed on the sliding plate through screw connection.

Has the advantages that: when the device is used, firstly, the motor is driven, pulse signals are received, the motor drives the moving block to perform linear motion through the lead screw mechanism, the moving block is fixedly connected with the sliding plate, the photosensitive element is fixed on the sliding plate, the photosensitive element is driven to realize reciprocating linear motion, the device is quick and accurate in focusing, the whole device is simple in structure, the speed of the moving speed of the sliding plate can be controlled through the frequency of the changed pulse signals, limit signals can be triggered when the shielding piece at the bottom of the sliding plate is close to the limit switch, and the motor is controlled to stop or move reversely.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be further described with reference to fig. 1.

The utility model provides a full automatic focusing device, including preceding fixed plate 10, after-fixing plate 20, motor 30, lead screw mechanism 40 and movable block 50 all arrange between preceding fixed plate 10 and after-fixing plate 20, motor 30 passes through lead screw mechanism 40 and drives movable block 50 and do straight reciprocating motion, fix two parallel guide bars 60 between preceding fixed plate 10 and after-fixing plate 20, fixed slide 70 on the movable block 50, two guide bars 60 freely pass perpendicularly from the face of slide 70, drive slide 70 and move along two guide bars 60 together when movable block 50 moves, arrange limit switch 80 between preceding fixed plate 10 and the after-fixing plate 20, slide 70 passes through limit switch 80's top in the removal process, and the bottom of slide 70 is equipped with the shielding piece that triggers limit switch 80, install photosensitive element 90 in the slide 70 face. During the use of this application, at first driving motor 30 accepts pulse signal, and motor 30 passes through screw mechanism 40 and drives movable block 50 and carry out linear motion, and movable block 50 and slide 70 fixed connection fix light sensing component 90 on the slide 70 to drive light sensing component 90 and realize reciprocal linear motion, realize quick, accurate focusing purpose, whole device simple structure, convenient operation. The speed of the sliding plate 70 can be controlled by changing the frequency of the pulse signal, and the limit signal is triggered when the bottom shielding plate of the sliding plate 70 approaches the limit switch 80, so as to control the motor 30 to stop or move the moving block 50 in the reverse direction.

Further, the front fixing plate 10 and the rear fixing plate 20 are vertically arranged and are parallel to each other.

Preferably, the limit switch 80 is in a U-shaped groove shape, and when the sliding plate 70 moves, the shielding piece at the bottom of the sliding plate 70 passes through the groove of the limit switch 80.

Further, one of the guide bars 60 adjacent to the motor 30 is sleeved with a spring 100 and a bushing 110, one end of the spring 100 abuts against the front fixing plate 10, the other end of the spring 100 abuts against one end of the bushing 110, and the other end of the bushing 110 is fixed to the slide plate 70 by a screw connection. The shaft sleeve 110 is fixedly connected with the sliding plate 70, so that the sliding plate 70 can move more stably, and in addition, the lead screw mechanism 40 is easy to have a movement gap due to abrasion in the movement process, the movement gap can increase the positioning error of linear movement and repeated positioning, and the problems of high noise, low movement precision and the like are caused. After the spring 100 is added, the spring 100 eliminates the movement clearance, and in addition, the shaft sleeve 110 is longer, so that the length of the matching surface is increased, and the guiding is more stable.

It should be understood that the above description of the specific embodiments is only for the purpose of explanation and not for the purpose of limitation. Obvious changes or variations caused by the spirit of the present invention are within the scope of the present invention.

Claims

1. A full-automatic focusing device is characterized in that: the device comprises a front fixing plate (10), a rear fixing plate (20), a motor (30), a screw rod mechanism (40) and a moving block (50), wherein the motor (30), the screw rod mechanism (40) and the moving block (50) are uniformly arranged between the front fixing plate (10) and the rear fixing plate (20), the motor (30) drives the moving block (50) to do linear reciprocating movement through the screw rod mechanism (40), two parallel guide rods (60) are fixed between the front fixing plate (10) and the rear fixing plate (20), a sliding plate (70) is fixed on the moving block (50), the two guide rods (60) vertically and freely penetrate through the plate surface of the sliding plate (70), the sliding plate (70) is driven to move along the two guide rods (60) when the moving block (50) moves, a limit switch (80) is arranged between the front fixing plate (10) and the rear fixing plate (20), and the sliding plate (70) passes through the upper part of the limit switch (, and the bottom of the sliding plate (70) is provided with a shielding sheet for triggering the limit switch (80), and the surface of the sliding plate (70) is internally provided with a photosensitive element (90).

2. The automatic focusing device of claim 1, wherein: the front fixing plate (10) and the rear fixing plate (20) are vertically arranged and are parallel to each other.

3. The automatic focusing device of claim 2, wherein: the limiting switch (80) is in a U-shaped groove shape, and when the sliding plate (70) moves, the shielding sheet at the bottom of the sliding plate (70) penetrates through the groove of the limiting switch (80).

4. The automatic focusing device of claim 2, wherein: one guide rod (60) close to the motor (30) is sleeved with a spring (100) and a shaft sleeve (110), one end of the spring (100) abuts against the front fixing plate (10), the other end of the spring (100) abuts against one end of the shaft sleeve (110), and the other end of the shaft sleeve (110) is fixed on the sliding plate (70) through screw connection.