CN210185561U

CN210185561U - Optometer for measuring PD by linear array CCD sensor

Info

Publication number: CN210185561U
Application number: CN201920583174.3U
Authority: CN
Inventors: Kaibo Zhuo; 卓开波
Original assignee: Ningbo Jieshilong Optical Instrument Co Ltd
Current assignee: Ningbo Jieshilong Optical Instrument Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-03-27
Anticipated expiration: 2029-04-26

Abstract

The utility model discloses an optometry appearance of linear array CCD sensor measurement PD, the on-line screen storage device comprises a base, side at the base is equipped with switch, sliding connection has control panel on the base, be equipped with the aircraft nose above control panel, the place ahead at the aircraft nose is equipped with the measuring aperture, be equipped with the display screen at the rear of aircraft nose, be equipped with the head support frame with aircraft nose parallel arrangement on the base, be equipped with two infrared emission lamps in the base, be equipped with infrared optical filter in infrared emission lamp's top, be equipped with the reticle to infrared emission lamp in the aircraft nose, be equipped with CCD linear array sensor in the top of reticle, linear array CCD sensor electricity is connected with the treater, and the treater is connected with the display screen electricity, is equipped with the lens hood between reticle and linear array CCD sensor. The utility model discloses through the reticle formation of image on the linear array CCD sensor after luminous LED, the formation of image through the linear array CCD sensor shifts the state and calculates the PD value, and part good reliability, the precision is high, does not wear and tear, characteristics such as life cycle length.

Description

Optometer for measuring PD by linear array CCD sensor

Technical Field

The utility model relates to a computer optometry appearance technical field, especially an optometry appearance of PD is measured to linear array CCD sensor.

Background

At present, most of PD (interpupillary distance) measurement of the existing optometry instruments adopts a rotary potentiometer, the PD value is calculated through AD conversion according to the voltage change output by the potentiometer, but the adopted potentiometer needs to guide the potentiometer to rotate by a traction rope, so that the problems of abrasion, looseness, falling off and the like of the traction rope can be caused, and the PD measurement precision is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving above-mentioned prior art not enough and provide an optometry appearance of PD is measured to linear array CCD sensor, this optometry appearance comprises infrared emission lamp, reticle and linear array CCD sensor, on the linear array CCD sensor through the reticle formation of image after luminous LED, the formation of image through linear array CCD sensor shifts the state and calculates the PD value, has that the part reliability is good, and the precision is high, does not wear and tear, the characteristics of life cycle length.

In order to achieve the above object, the utility model relates to an optometry instrument for measuring PD by a linear array CCD sensor, which comprises a base, a power switch is arranged at the side edge of the base, a control panel is connected on the base in a sliding way, a machine head is arranged above the control panel, a measuring hole is arranged in front of the machine head, a display screen is arranged at the rear of the machine head, a head support frame which is arranged in parallel with the machine head is arranged on the base, two infrared emission lamps which are symmetrically arranged along the central line of the base are arranged in the base, an infrared filter which is fixed in the base is arranged above the infrared emission lamps, a reticle which is right opposite to the infrared emission lamps is arranged in the machine head, a linear array CCD sensor which is electrically connected with a controller of the display screen is arranged above the reticle, the linear array CCD sensor is right opposite to the reticle and parallel with the reticle, a light shield is arranged between the reticle and, the center of the linear array CCD sensor, the center of the reticle and the center of the measuring hole are all located in the middle of the machine head.

The control panel comprises a control panel body, a rocker, a measuring switch, an adjusting button and a locking switch, wherein the rocker is used for controlling alignment and focusing, the measuring switch is used for turning on or off an optometry program, the adjusting button is used for controlling the lifting of a chin rest, the rocker, the adjusting button and the locking switch are all arranged on the control panel body, and the measuring switch is arranged on the rocker.

The head support frame comprises a chin support and a forehead support, the lower end of the forehead support is connected with the base, and the chin support is arranged on the forehead support.

The utility model discloses the optometry appearance of PD is measured to a linear array CCD sensor who obtains, its technological effect is: through designing the specific position to infrared emission lamp, reticle and linear array CCD sensor to drive the aircraft nose and remove and realize adjusting the position back of reticle and linear array CCD sensor, obtain the PD value through the reticle formation of image on linear array CCD sensor by infrared emission lamp, need not to set up the structure of haulage rope with this, finally avoid because the haulage rope wearing and tearing, become flexible and fall off the scheduling trouble and lead to the problem that PD measurement accuracy reduces, consequently this structure has the connection reliability of each part height, measurement accuracy is high, do not wear and tear, life cycle length's characteristics.

Drawings

Fig. 1 is a schematic structural diagram of an optometry apparatus for measuring PD by a linear array CCD sensor in embodiment 1;

fig. 2 is a side view of an optometry instrument for measuring PD by a line CCD sensor of embodiment 1;

fig. 3 is a schematic view of the internal structure of a portion of the optometry instrument head for measuring PD by the line CCD sensor in embodiment 1, with the housing removed;

FIG. 4 is a schematic diagram showing the relative position structures of the line CCD sensor, the reticle and the infrared emission lamp of embodiment 1;

FIG. 5 is an imaging schematic diagram of the central points of two infrared emission lamps and the central point of a linear array CCD sensor on the same straight line in an initial state;

FIG. 6 is a schematic diagram of the imaging of two IR-emitting lamps on a linear array CCD sensor as the sensor moves to the left;

fig. 7 is a pulse pattern at the time of measurement of the line CCD sensor of example 1.

In the figure: the device comprises a base 1, a power switch 2, a control panel 3, a machine head 4, a measuring hole 5, a display screen 6, a head supporting frame 7, an infrared emission lamp 8, an infrared filter 9, a reticle 10, a linear array CCD sensor 11, a light shield 12, a control panel body 13, a rocker 14, a measuring switch 15, an adjusting button 16, a locking switch 17, a chin rest 18 and a forehead support 19.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1:

as shown in fig. 1-4, the optometry instrument for measuring PD by using a linear array CCD sensor provided in this embodiment includes a base 1, a power switch 2 is disposed on a side of the base 1, a control panel 3 is slidably connected to the base 1, a head 4 is disposed above the control panel 3, a measuring hole 5 is disposed in front of the head 4, a display screen 6 is disposed behind the head 4, a head support 7 is disposed on the base 1 and is parallel to the head 4, two infrared emission lamps 8 are symmetrically disposed along a central line of the base 1, an infrared filter 9 fixed in the base 1 is disposed above the infrared emission lamps 8, a reticle 10 facing the infrared emission lamps 8 is disposed in the head 4, a linear array CCD sensor 11 electrically connected to a controller of the display screen 6 is disposed above the reticle 10, the linear array CCD sensor 11 faces the reticle 10 and is parallel to the reticle 10, a light shield 12 is arranged between the reticle 10 and the linear array CCD sensor 11, and the center of the linear array CCD sensor 11, the center of the reticle 10 and the center of the measuring hole 5 are all positioned in the middle of the machine head 4.

The control panel 3 comprises a control panel body 13, a rocker 14, a measuring switch 15, an adjusting button 16 and a locking switch 17, the rocker 14, the adjusting button 16 and the locking switch 17 are all arranged on the control panel body 13, the measuring switch 15 is arranged on the rocker 14, the rocker 14 is used for controlling alignment and focusing inside the handpiece 4, the locking switch 17 is used for locking the handpiece 4 onto the base 1, the measuring switch 15 is used for switching on and off an optometry program, and the adjusting button 16 is used for adjusting the height of the chin rest 18.

The head support 7 comprises a chin rest 18 and a forehead support 19, the lower end of the forehead support 19 is connected with the base 1, and the chin rest 18 is arranged on the forehead support 19.

Here, it is to be noted that: the specific structure that the rocker 14 is used for controlling the movement of the handpiece 4 to align and focus and the adjusting button 16 is used for controlling the chin rest 18 to move up and down belongs to the prior art in the field of computer optometry instruments, so that the specific structure is not described in detail.

When the device is used specifically, firstly, the power switch 2 is pressed, the optometry instrument is started, then the detected person puts the chin on the chin rest 18, and then the height of the chin rest 18 is adjusted through the adjusting button 16, as shown in fig. 5 and 7, the eyes of the detected person and the measuring hole 5 are positioned on the same horizontal line, the chin rest 18 is positioned at the central position opposite to the machine head 4, so that the centers of the measuring hole 5 and the linear array CCD sensor 11 are positioned at the middle position of the two eyes of the detected person during measurement; as shown in fig. 6, the machine head 4 is moved by the rocker 14, after the center of the left eye pupil of the measured person is aligned with the center of the measuring hole 5 according to the pupil imaging information on the display screen 6, the light emitted by the infrared emission lamp 8 passes through the center of the reticle 10 and then is imaged on the linear array CCD sensor 11, and then is sent to the controller of the display screen 6, and after the imaging position (shown in fig. 5) on the linear array CCD sensor 11 is compared in the initial state of the infrared emission lamp 8 stored in the controller in advance, the offset distance PD1 between the moved machine head 4 and the center position is calculated (the center position of the optometry instrument in the initial state of the machine head 4); then, the head 4 is slid to the right eye of the measured person, the center of the pupil of the right eye of the measured person is aligned to the center of the measuring hole 5 according to the pupil imaging information on the display screen 6, then the light emitted by the infrared emission lamp 8 passes through the center of the reticle 10 and then is imaged on the linear array CCD sensor 11, then the light is sent to the controller of the display screen 6, and the imaging position (shown in figure 5) on the linear array CCD sensor 11 is compared by using the infrared emission lamp 8 stored in advance by the controller in the initial state, the offset distance PD2 between the head 4 and the center position after moving is calculated, then the data PD1 and PD2 measured twice are added, the PD (interpupillary distance) of the measured person can be obtained and displayed on the display screen 6, therefore, the specific positions of the infrared emission lamp 8, the reticle 10 and the linear array CCD sensor 11 are designed through the above structural design, and the head 4 is driven to move to realize the adjustment of the positions of the reticle 10 and the linear array CCD sensor 11, the infrared emission lamp 8 is imaged on the linear array CCD sensor 11 through the reticle 10 to obtain the PD value, so that a structure of a traction rope is not required to be arranged, and the problem that the PD measurement precision is reduced due to the fact that the traction rope is abraded, loosened, falls off and other faults is finally avoided. It should be noted that in this embodiment, the controller connected to the display screen 6 is a conventional ARM chip, for example, the model is STM32F429, and the program that the PD value is finally obtained in the process that the single chip microcomputer of this model compares the signal value generated by the linear array CCD sensor 11 with the internal preset initial value after obtaining the signal value is a routine technical means for those skilled in the art, so that detailed description is not given here, and the linear array CCD sensor 11 is the TCD1708 under the toshiba flag. For how to calculate the value of PD1, firstly two data a1 and a2 can be measured according to the measurement principle, while two data H and L are fixed and determined during design, C1 is the offset of the optical center of the linear CCD sensor 11 from the center of the linear CCD sensor 11 after the linear CCD sensor 11 moves, PD1 is calculated according to the change of C1 and a2, and PD1 is the distance between the moving position of the head 4 and the center position. Similarly, the distance PD2 from the center position after the head 4 moves to the other side can be obtained. A1 judges the orientation of the handpiece 4, either to the left or to the right. The sum of the values of PD1 and PD2 is the PD value of the eye, and the specific calculation method described above is that the microchip is internally programmed and obtained, which is a conventional technique and therefore not described in detail.

It should be noted that: in this embodiment, a1 is the distance from the CCD starting point (i.e. the starting point of the pulse) to the first pulse; the A2 is the distance between two pulses, and the current PD position is A1+ A2/2 (namely the center of A2); a counter can be programmed, and the value of the counter when the pulse arrives can be recorded (multiplied by a fixed factor, which is the distance), note that: the two pulses are actually images of the two infrared emission lamps 8 on the linear array CCD sensor 11 through the reticle 10, and the calculation process of how the single chip microcomputer obtains the CCD images belongs to the conventional technology in the field, so the detailed description is not needed.

Claims

1. The utility model provides an optometry appearance of linear array CCD sensor measurement PD, including base (1), side at base (1) is equipped with switch (2), sliding connection has control panel (3) on base (1), be equipped with aircraft nose (4) in control panel (3) top, be equipped with measuring aperture (5) in the place ahead of aircraft nose (4), rear at aircraft nose (4) is equipped with display screen (6), be equipped with head support frame (7) with aircraft nose (4) parallel arrangement on base (1), its characterized in that: be equipped with two infrared emission lamp (8) along base (1) central line symmetrical arrangement in base (1), be equipped with infrared optical filter (9) of fixing in base (1) above infrared emission lamp (8), be equipped with reticle (10) just to infrared emission lamp (8) in aircraft nose (4), be equipped with linear array CCD sensor (11) of being connected with the controller electricity of display screen (6) above reticle (10), linear array CCD sensor (11) just is being parallel to each other with reticle (10) to reticle (10), is equipped with lens hood (12) between reticle (10) and linear array CCD sensor (11), the center of reticle (10) and the center of measuring hole (5) all are located the intermediate position of aircraft nose (4).

2. The optometry unit for measuring PD by the linear array CCD sensor as claimed in claim 1, characterized in that: the control panel (3) comprises a control panel body (13), a rocker (14), a measuring switch (15), an adjusting button (16) and a locking switch (17), the rocker (14), the adjusting button (16) and the locking switch (17) are all arranged on the control panel body (13), and the measuring switch (15) is arranged on the rocker (14).

3. The optometry unit for measuring PD by the linear array CCD sensor as claimed in claim 1, characterized in that: the head support frame (7) comprises a chin support (18) and a forehead support (19), the lower end of the forehead support (19) is connected with the base (1), and the chin support (18) is arranged on the forehead support (19).