CN208524843U - A kind of sight tester - Google Patents
A kind of sight tester Download PDFInfo
- Publication number
- CN208524843U CN208524843U CN201721137252.4U CN201721137252U CN208524843U CN 208524843 U CN208524843 U CN 208524843U CN 201721137252 U CN201721137252 U CN 201721137252U CN 208524843 U CN208524843 U CN 208524843U
- Authority
- CN
- China
- Prior art keywords
- convex lens
- light
- emitting source
- shield cover
- light emitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Eyeglasses (AREA)
Abstract
A kind of sight tester, including light-shield cover and the imaging device and visual device that are set to inside light-shield cover；The imaging device includes light emitting source, the convex lens for refracted optical signal and the optical screen for imaging for the sending optical signal for being set to the sliding axle of the light-shield cover bottom and being from left to right sequentially fixed on sliding axle；Equipped with the positioning button for adjusting convex lens displacement on the downside of the convex lens；The visual device includes periscope and eyepiece；The light inlet of the periscope is placed in above convex lens, and light-emitting window connects eyepiece；Eyesight ruler is provided at three times focal length in one times away from convex lens focal length below the sliding axle.
Description
Technical field
The utility model relates to a kind of sight testers, belong to eyesight detection technique field.
Background technique
With the development of society, the pressure of working and learning is continuously increased, near-sighted people is more and more, and the journey of myopia
It spends increasingly, needs constantly to replace glasses, traditional eyesight detection technique will receive the shadow of external environment and human factor
It rings, there are certain error, the glasses allotted are not necessarily most suitable the eyesight detected.
Utility model content
In order to solve the above problem present in the prior art, the utility model provides a kind of sight tester, the view
Tension gauge can reduce the interference of human factor and environmental factor, accurately measure eyesight.
The technical solution of the utility model is as follows:
A kind of sight tester, including light-shield cover and the imaging device and visual device that are set to inside light-shield cover；Institute
Stating imaging device includes the hair for being set to the sliding axle of the light-shield cover bottom and being from left to right sequentially fixed on sliding axle
The light emitting source of optical signals, the convex lens for refracted optical signal and the optical screen for imaging；Equipped with tune on the downside of the convex lens
Save the positioning button of convex lens displacement；The visual device includes periscope and eyepiece；The light inlet of the periscope is placed in convex
Above lens, light-emitting window connects eyepiece；It is provided in one times away from convex lens focal length at three times focal length below the sliding axle
Eyesight ruler.
Further, the external calculating meter of the light emitting source can issue eyesight detection symbols taking human as control.
Further, the distance of the light emitting source to convex lens is greater than 1 times of focal length.
Further, the central junction line of the light emitting source, convex lens and optical screen is located at same axis.
Further, the light inlet can follow convex lens to move together, and be always positioned above convex lens.
The utility model has the following beneficial effects:
1, a kind of sight tester structure of the utility model is simple, is convenient for Operation and maintenance.
2, light-shield cover is housed outside the utility model kind sight tester, it is dry that extraneous factor can be excluded when giving a test of one's eyesight
It disturbs.
3, the utility model kind sight tester is provided with eyesight ruler, can measure more accurate eyesight.
4, the utility model kind sight tester adjustable extent is wider, and the eyesight of survey is more accurate.
Detailed description of the invention
Fig. 1 is a kind of outer wall opening measuring device overall structure diagram in the utility model.
Appended drawing reference indicates in figure are as follows:
1, imaging device；11, light emitting source；12, convex lens；13, optical screen；14, sliding axle；15, positioning button；16, eyesight ruler；
2, visual device；21, periscope；211, light inlet；212, light-emitting window；22, eyepiece；3, light-shield cover.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, a kind of sight tester, it is characterised in that: including light-shield cover 3 and be set to inside light-shield cover 3
Imaging device 1 and visual device 2；The imaging device 1 includes being set to the sliding axle 14 of 3 bottom of light-shield cover and from a left side
To the right side be sequentially fixed on sliding axle 14 sending optical signal light emitting source 11, for refracted optical signal convex lens 12 and be used for
The optical screen 13 of imaging；Equipped with the positioning button 15 for adjusting the displacement of convex lens 12 on the downside of the convex lens 12；The visual device 2 includes
Periscope 21 and eyepiece 22；The light inlet 211 of the periscope 21 is placed in 13 top of convex lens, and light-emitting window 212 connects mesh
Mirror 22；14 lower section of sliding axle is provided with eyesight ruler 16 at three times focal length in 12 1 times away from convex lens focal lengths.
Further, the light emitting source 11 external calculating meter can issue eyesight detection symbols taking human as control.
Further, the central junction line of the light emitting source 11, convex lens 12 and optical screen 13 is located at same axis
Further, the distance of the light emitting source 11 to convex lens 12 is greater than 1 times of focal length.
Further, the light inlet 211 can follow convex lens 12 to move together, and be always positioned on convex lens 12
Side.
Working principle of the utility model is:
When object distance is greater than 2 times of focal lengths, then image distance is between 1 times of focal length and 2 times of focal lengths, at the real image for standing upside down, reducing；When
Less than 2 times focal lengths of object distance, be greater than 1 times of focal length when, then image distance be greater than 2 times of focal lengths, at stand upside down, amplification real image.Image distance is big at this time
In object distance, as bigger than object；When object distance is equal to 2 times of focal lengths, then image distance is also in 2 times of focal lengths, at stand upside down, etc. big real image.At this time
Object distance is equal to image distance, as equal in magnitude with object；It is not imaged when object distance is equal to 1 times of focal length；When less than 1 times focal length of object distance is into just
The big virtual image is stood up, cannot see that picture on optical screen；
Patient, which only needs to see by eyepiece 23, when detection looks into picture on optical screen 13, see as the case where tell doctor, doctor
The raw size for only needing to adjust the position change picture that positioning button 15 transfers convex lens 12, and control light emitting source 11 issue different directions
C or E and inquire the case where patient sees picture.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (3)
1. a kind of sight tester, it is characterised in that: including light-shield cover (3) and be set to the internal imaging dress of light-shield cover (3)
Set (1) and visual device (2)；The imaging device (1) include be set to the light-shield cover (3) bottom sliding axle (14) and
From left to right it is sequentially fixed at light emitting source (11), the convex lens for refracted optical signal of the sending optical signal on sliding axle (14)
(12) and for imaging optical screen (13)；Equipped with the positioning button for adjusting convex lens (12) displacement on the downside of the convex lens (12)
(15)；The visual device (2) includes periscope (21) and eyepiece (22)；The light inlet (211) of the periscope (21) is set
Above convex lens (12), light-emitting window (212) connects eyepiece (22)；Away from convex lens (12) one below the sliding axle (14)
Times focal length is provided with eyesight ruler (16) at three times focal length；The light emitting source (11), convex lens (12) and optical screen (13) center
Connecting line is located at same axis；The external computer of light emitting source (11) issues eyesight detection for controlling light emitting source (11)
Symbol.
2. a kind of sight tester as described in claim 1, it is characterised in that: the light emitting source (11) to convex lens (12) away from
From greater than 1 times of focal length.
3. a kind of sight tester as claimed in claim 2, it is characterised in that: the light inlet (211) can follow convex lens
(12) it moves together, and is always positioned above convex lens (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721137252.4U CN208524843U (en) | 2017-09-06 | 2017-09-06 | A kind of sight tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721137252.4U CN208524843U (en) | 2017-09-06 | 2017-09-06 | A kind of sight tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208524843U true CN208524843U (en) | 2019-02-22 |
Family
ID=65399907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721137252.4U Expired - Fee Related CN208524843U (en) | 2017-09-06 | 2017-09-06 | A kind of sight tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208524843U (en) |
-
2017
- 2017-09-06 CN CN201721137252.4U patent/CN208524843U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190222 |