CN202654101U

CN202654101U - Eye chart

Info

Publication number: CN202654101U
Application number: CN 201220318612
Authority: CN
Inventors: 刘梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-03
Filing date: 2012-07-03
Publication date: 2013-01-09
Anticipated expiration: 2022-07-03

Abstract

The utility model discloses an eye chart, belongs to a physical examination thing, and in particular relates to the eye chart used for checking vision. The eye chart is characterized in that the front surface of a cuboid-shaped eye chart box shell is a transparent glass, and the upper and lower ends of a box body are respectively provided with a rotating roller with a handle; the rotating rollers are twined with a strip eye chart the surface of which is printed with at least two groups of full set vision signs, a paper surface printed vision signs is positioned behind the transparent glass, and the rear of the strip eye chart is provided with a plate-shaped LED (light-emitting diode) light-emitting screen; more than two sets of eye chart units are printed on the strip eye chart, and the rotating rollers are rotated; and the eye chart arranged behind the transparent glass is changed, the eye chart is displayed randomly every time, and the speculation behavior that some one recites the eye chart can be avoided. The eye chart provided by the utility model has the advantages that the plate-shaped LED light-emitting screen is adopted as a light source instead of the common fluorescent tube, the photometric brightness of the whole eye chart is uniform and soft, thereby being beneficial for people to be checked to recognize the vision signs, thus the detection is more exact and reliable, in addition, and the LED light-emitting screen has a good energy-saving effect.

Description

Visual acuity chart

Technical field

This utility model belongs to physical examination articles, particularly is used for the visual acuity chart of testing eyesight.

Background technology

Visual acuity chart is the most frequently used instrument that checks people's vision, existing visual acuity chart is owing to the vision symbol that the surface shows is fixed, usually some people adopts the means of back of the body visual acuity chart to hide inspection, seriously influenced the fairness of health check-up, existing visual acuity chart adopts the tubulose daylight lamp as light source in addition, although than the incandescent lamp uniform-illumination, still have the even phenomenon of uneven illumination, affect check result.

The utility model content

The deficiency that existing E snellen chart visual acuity symbol is fixed in order to overcome, surperficial uneven illumination is even, this utility model provides a kind of visual acuity chart, and this visual acuity chart not only can change the vision symbol easily, and surperficial uniform-illumination.

The technical scheme that its technical problem that solves this utility model adopts is: a kind of visual acuity chart, it is characterized in that: the front surface of the visual chart box shell of cuboid is clear glass, the transfer roller with handle is equipped with respectively at two ends about in the casing, the rectangular visual acuity chart that the surface is printed on a complete set of vision symbol of at least two groups in circumvolution on the transfer roller, the paper that is printed on the vision symbol is positioned at the clear glass back, and tabular LED luminescent screen is equipped with in rectangular visual acuity chart back.

The beneficial effects of the utility model are owing to the visual acuity chart unit that is printed at rectangular visual acuity chart more than two covers, use the rotatable handle transfer roller.Just can change the visual acuity chart of clear glass back, because the visual acuity chart that reveals has randomness at every turn, can avoid one or two people to carry on the back the opportunistic practice of visual acuity chart, this utility model is improved to tabular LED luminescent screen with light source by common fluorescent tube, make on the whole visual acuity chart brightness evenly soft, be conducive to the checked people and identify the vision symbol, so that detect more accurately and reliably, other LED luminescent screen good energy-conserving effect.

Description of drawings

Fig. 1 is structural representation of the present utility model,

Fig. 2 is the left view of Fig. 1.

Among the figure, 1. shell, 2. transfer roller, 3. transfer roller handle, 4. clear glass, 5. vision symbol, 6. rectangular visual acuity chart, 7. tabular LED luminescent screen.

The specific embodiment

The specific embodiment of the present utility model is, as shown in the figure:

Embodiment 1, a kind of visual acuity chart, it is characterized in that: the front surface of the visual chart box shell 1 of cuboid is clear glass 4, the transfer roller 2 with handle 3 is equipped with respectively at two ends about in the casing, the rectangular visual acuity chart 6 that the surface is printed on a complete set of vision symbol of at least two groups in circumvolution on the transfer roller, the paper that is printed on the vision symbol is positioned at the clear glass back, and tabular LED luminescent screen 7 is equipped with in rectangular visual acuity chart back.

Claims

1. visual acuity chart, it is characterized in that: the front surface of the visual chart box shell of cuboid is clear glass, the transfer roller with handle is equipped with respectively at two ends about in the casing, the surperficial visual acuity chart that at least two groups are printed on a complete set of vision symbol that is printed in circumvolution on the transfer roller, the paper that is printed on the vision symbol is positioned at the clear glass back, and tabular LED luminescent screen is equipped with in rectangular visual acuity chart back.