CN2120548U

CN2120548U - Light-box for electronic two-light source visual testing chart

Info

Publication number: CN2120548U
Application number: CN 92204387
Authority: CN
Inventors: 瞿佳; 沈克诚
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-11
Filing date: 1992-03-11
Publication date: 1992-11-04

Abstract

The utility model relates to an electronic two-light-source near vision chart light box, comprising a chart cover (1), a middle partition (2), a light source (3) and a box body (4). The utility model is characterized in that the chart cover is in oblique position, the lower part of the chart cover is farther away from the light source (3) then away from the upper part. The surface of a near vision chart is divided into three layers, an inner layer is a white organic glass sheet, an outer layer is a transparent organic glass sheet, and a middle layer is a film printed by various eyesight charts. The middle partition is arranged between the chart cover and the light source, and the light source is two small florescent lamps, which is driven by an electronic ballast. The utility model has the advantages of even surface lighting and durable and abrasive-resistant surface, and the utility model can start under low voltage, the chart covers of different optotypes can be interchanged, etc. The electronic two-light-source near vision chart light box can also be used as a desk lamp, a wall lamp and a viewing lamp.

Description

Light-box for electronic two-light source visual testing chart

This utility model is a kind of electronic double light source near vision test type lamp box, belongs to medical instruments field.

Near vision test type is mainly used in existing closely examination of visual acuity, be generally art paper printing or photographic paper copying, therefore the brightness of checking changes with environmental change, so it is unstable and nonstandard, the surface is also very easily stained, influenced the accuracy of examination of near vision, these all are defectives of existing examination of near vision.

The purpose of this utility model is that design is a kind ofly thrown light on evenly, brightness is suitable, the fluorescent lamp low-voltage can startup, the table lid of flicker free, different sighting targets is interchangeable, the surperficial durable wear of table lid is decreased, and can make the novel near vision test type lamp box that desk lamp, wall lamp and film viewer use simultaneously.

Content of the present utility model and feature are described below in conjunction with the accompanying drawings:

Fig. 1 is a front view of the present utility model, and Fig. 2 is a side view.

The utility model is made up of table cover (1), central dividing plate (2), light source (3) and casing (4). Place a milky central dividing plate between table cover and the light source, table cover is obliquity, and the below is far away than the top apart from light source (3). Light source is two little fluorescent tubes, vertically places at a certain distance. Based on such design, it is very even to throw light on, and the upper and lower, left and right illumination on the surface of table cover is basically identical, and brightness is suitable. Simultaneously because two fluorescent tube two ends are positioned at casing two ends architrave, can not use the affect one's power of vision Uniform Illumination on surface of two ends blackout long afterwards because of fluorescent tube.

Another feature of the present utility model is: the table cover of this light-box for electronic two-light source visual testing chart can be made into a plurality of, makes the table cover on different sighting targets surface interchangeable, with the needs of the different scopes of examination of facility.

The 3rd feature of the present utility model is: the fluorescent lamp of this electronic double light source near vision test type lamp box does not adopt traditional inductance type ballast, but two tubes adopt an electronic ballast (5), thereby save starter, had that low-voltage can start, fluorescent tube flicker free, economize on electricity and an advantage such as in light weight.

The 4th feature of the present utility model is: the organic thin plate of surface employing milky of the two light source near vision test type lamp box table lids of this electronics load onto topped again layer of transparent lucite thin plate behind the transparent film that is printed on sighting target, so fastness is good, durable in use.

The 5th feature of the present utility model is: this electronic double light source near vision test type lamp box except that do examination of visual acuity with, but the usefulness of double as desk lamp, wall lamp and film viewer also.

For most preferred embodiment, it is injection molded that casing and Biao Gai are ABS, and the angle of inclination between table lid and the light source is about 20 degree, and central dividing plate is the PVC material, apart from the about 3cm in surface of table lid.

Claims

1, a kind ofly is used to check the closely electronic double light source near vision test type lamp box of visual function, form by table lid (1), central dividing plate (2), light source (3) and casing (4), it is characterized in that: table lid (1) is obliquity, the below is far away than the top with light source (3) distance, places a central dividing plate (2) between table lid and the light source.

2, electronic double light source near vision test type lamp box according to claim 1 is characterized in that: light source is that two little fluorescent tubes are vertically placed at a certain distance.

3, according to claim 1,2 described electronic double light source near vision test type lamp boxes, it is characterized in that: two little fluorescent tubes (3) are driven by a secondary electronic ballast.

4, electronic double light source near vision test type lamp box according to claim 1 is characterized in that: totally three layers on the surface of table lid (1), packing between promptly white transparent organic thin plate and the transparent organic glass thin plate is printed on the transparent film of various visual acuity charts.