CN208319189U - The projector of adjustable sighting target surface illuminance dims lens assembly - Google Patents

Abstract

The utility model relates to a kind of projectors of adjustable sighting target surface illuminance to dim lens assembly, which is characterized in that the light modulation lens assembly includes inlaying device, light passing amount control device, adjusts control stick and lid；The inlaying device center offers consistent reach through hole, corresponding to the position through through-hole, the annular groove for being embedded the light passing amount control device is offered at the top of the inlaying device, position corresponding to the annular groove, the side of the inlaying device offers the slideway opening for carrying out arcuate movement for the adjusting control stick, the lid is fixedly connected at the top of the inlaying device, light hole is offered at the top of the lid, position corresponding to the light hole, the cover center, which extends outward, is provided with one for being attached fixed ring structure with projector projection lens.The utility model can be widely applied to the test assessment lower than visual acuity under the conditions of normal luminance.

Description

The projector of adjustable sighting target surface illuminance dims lens assembly

Technical field

The utility model is to shine about a kind of for being mounted on the adjustable sighting target surface before projector's projection lens The projector of degree dims lens assembly, is related to eyesight detection technique field.

Background technique

A variety of eye diseases such as age-related cataract can lead to human eye and show more in ambient light illumination decline Significant visual acuity decline, and then visual correlation viability of the patient under half-light environment is significantly affected, make it in illumination item The words identification information be beyond recognition in environment when part is bad cannot find rapidly barrier, lead to inconvenient or even dangerous hair It is raw.Actual environment in daily life is extremely complex, individual be lower than normal luminance under the conditions of visual sensitivity to measure its Real life ability is often more meaningful.Therefore, it is necessary under the conditions of evaluating subject's normal luminance while visual acuity, it is right Its visual acuity under the conditions of being lower than normal luminance is assessed, and is shone according to assessment result the minimum environment in subject's life Bright condition provides certain suggestion, thus inconvenient and dangerous caused by visual acuity decline when avoiding illumination condition bad.

(sighting target surface illuminance 500lux or more) is quick with the view of visual chart sighting target test subject under the conditions of normal luminance Degree is the visual acuity test method relatively generallyd use at present.The test method can not comment the visual acuity under half-light environment Valence.In visual acuity test device field, sighting target surface illuminance can be continuously adjusted according to the requirement of test purpose by still lacking To realize the device of visual acuity test under different illumination conditions.In visual function assessment experimental field, researcher's multi-pass is excessively to existing There is device power-up to reequip and realizes the purpose tested lower than visual acuity under the conditions of normal luminance in the method for adjusting transmitting light source.It is above-mentioned Method it is relatively complicated and it is relatively difficult to achieve sighting target illumination is continuously adjusted, limit visual acuity measuring technology under different illumination conditions Application and popularization.Therefore, it is necessary to which the device can be passed through with the device of existing projection visual chart hardware compatibility by designing one kind The function of expanding existing projector keeps visual acuity measurement under different illumination conditions convenient feasible.

Summary of the invention

It can be realized different lighting levels' visual acuitys in view of the above problems, the object of the present invention is to provide one kind to survey It tries and the projector that can be continuously adjusted to the surface illuminance of projection sighting target dims lens assembly.

To achieve the above object, the utility model takes following technical scheme: a kind of throwing of adjustable sighting target surface illuminance Shadow visual chart dims lens assembly, which is characterized in that the light modulation lens assembly includes inlaying device, light passing amount control device, adjusts Save control stick and lid；The inlaying device center offers consistent reach through hole, described corresponding to the position through through-hole The annular groove for being embedded the light passing amount control device is offered at the top of inlaying device；Corresponding to the position of the annular groove, The side of the inlaying device offers the slideway opening for carrying out arcuate movement for the adjusting control stick；It is described to inlay dress The top set is fixedly connected with the lid, offers light hole at the top of the lid, described corresponding to the position of the light hole Cover center, which extends outward, is provided with one for being attached fixed ring structure with projector projection lens.

Further, the light passing amount control device includes arc shaped blade, blade fixed disk and runner block, and the blade is solid Price fixing is fixed in the annular groove, and the runner block is fixed in the lid.

Further, the arc shaped blade uses several sizes, the identical thin metal arc shaped blade of structure, the arc-shaped leaf Piece integrally opens and closes formation close to circular light passing region, and it is solid that one end of each arc shaped blade upwardly extends one top of setting Fixed column, the other end of each arc shaped blade extend downward with a lower part fixed column.

Further, the blade fixed disk uses annular sheet metal, equally circumferentially spaced in the blade fixed disk There is the location hole for wearing the lower part fixed column, all arc shaped blade arrangements cover the arc shaped blade entirely in imbricate The ring discoid region of the blade fixed disk is covered, the outer end of the blade fixed disk, which further extends outward, to be provided with and the tune The connection handle that section control stick is fixedly connected.

Further, the runner block uses annular disk, and the runner block bottom has been provided at circumferentially spaced for described in confession Top fixed column carries out the radial groove of radial motion, and the adjusting control stick controls the arc along the slideway harness motion Shape blade is moved in the radial groove, and then changes the size in light passing region.

Further, the ring structure and the accessible length of projector's projection lens are 4mm.

Because the utility model adopts the above technical scheme, it has the following advantages: 1, with adjust light source illumination level and obtain The device for obtaining different illumination sighting targets is different, and the utility model realizes sighting target table projected to projector with external lens assembly Face illumination continuously adjusts, strong with existing projector's equipment compatibility, avoids quick to regard under the different illumination conditions of realization The inconvenience of extensive booting repacking is tested and carried out to existing equipment to degree, and the utility model passes through one kind external to existing projection Light modulation lens assembly before visual chart projection lens, realization continuously adjust projected sighting target surface illuminance, thus easy to be easy The test lower than visual acuity under the conditions of normal luminance is realized capablely, has expanded the use scope of existing equipment.2, the utility model The light hole that external camera lens is formed with the iris that multiple overlapped arc shaped blades form, by changing diaphragm diameter Mode adjusts light passing bore dia and light passing amount, limits, realizes in original projector's equipment mark without gear in adjustment process The surface illuminance of projection sighting target is continuously adjusted in the range of quasi- illumination (usually 500lux), test is regarded to realize The Linear Control for marking illumination can meet the requirement of visual function test in the larger context.3, the utility model will be by more A overlapped thin metal arc blade group at iris type aperture insertion inlaying device in, form external light modulation camera lens, letter Just realize that visual acuity detects under different level conditions, the utility model is at low cost, easy to use, is more advantageous to this vision The promotion and popularization of constitution test.In conclusion the utility model can be widely applied to it is quick lower than regarding under the conditions of normal luminance The test of degree is assessed.

Detailed description of the invention

Fig. 1 is the lens assembly structural schematic diagram of the utility model；

Fig. 2 is the inlaying device structural schematic diagram of the utility model；

Fig. 3 is the cover body structure schematic diagram of the utility model；

Fig. 4 (a) and (b) are the structural schematic diagrams of the arc shaped blade of the utility model；

Fig. 5 is the blade fixed disk structural schematic diagram of the utility model；

Fig. 6 is the runner block structural schematic diagram of the utility model.

Specific embodiment

Come to carry out detailed description to the utility model below in conjunction with attached drawing.It should be appreciated, however, that attached drawing is provided only More fully understand the utility model, they should not be interpreted as limitations of the present invention.

As shown in Figure 1, the projector of the adjustable sighting target surface illuminance of the utility model dims lens assembly, including Inlaying device 1, adjusts control stick 2 and lid 3 at light passing amount control device.

As shown in Fig. 2, inlaying device 1 uses oblate rod structure, 1 center of inlaying device offers consistent reach through hole 11, right Ying Yu runs through the position of through-hole 11, and the annular groove 12 for being embedded light passing amount control device is offered at the top of inlaying device 1, corresponding In the position of the annular groove 12, the slideway that the side of inlaying device 1 offers for carrying out arcuate movement for adjusting control stick 2 is opened Mouth 13, slideway opening 13 are used to be adjusted so that adjusting the connection light passing amount control device of control stick 2 and controlling light passing amount control device Section, the top of inlaying device 1 is fixedly connected with lid 3.

As shown in figure 3, lid 3 uses hollow oblate rod structure, the top of lid 3 offers a light hole 31, corresponds to The position of light hole 31,3 center of lid, which extends outward, is provided with a ring to match with projector's projection lens size Shape structure 32.

In a preferred embodiment, as shown in Fig. 4~Fig. 6, light passing amount control device uses the design of iris Principle, adjusting control stick 2 is moved along slideway opening 13 changes iris by the arc shaped blade clutch for controlling iris The aperture of central area circle light hole, and then the light passing amount of projector's luminaire is controlled to reduce projected light Line.The light passing amount control device of the present embodiment includes arc shaped blade 4, blade fixed disk 5 and runner block 6, and blade fixed disk 5 is fixed It is arranged in annular groove 12, runner block 6 is fixed in lid 3.

The arc shaped blade of the present embodiment is several sizes, the identical thin metal arc shaped blade 4 of structure, and radian is according to device Depending on selected arc-shaped leaf the piece number, the present embodiment connects the folding formation of arc shaped blade 4 as far as possible The light passing region of subcircular, the radian of the arc shaped blade 4 of the present embodiment is 135 °, without being limited thereto as example.As shown in figure 4, One end of each arc shaped blade 4 upwardly extends one top fixed column 41 of setting, and the other end of each arc shaped blade 4 is to downward It stretches and is provided with a lower part fixed column 42.As shown in figure 5, the blade fixed disk 5 of the present embodiment is annular sheet metal, blade fixed disk It is circumferential at equal intervals on 5 to be provided with the location hole 51 positioned for wearing lower part fixed column 42 to arc shaped blade 4, location hole 51 quantity is identical as 4 quantity of arc shaped blade, and all arrangements of arc shaped blade 4 make the entirely covering blade of arc shaped blade 4 in imbricate The ring discoid region of fixed disk 5.The outer end of blade fixed disk 5, which further extends outward, to be provided with and adjusts the fixed company of control stick 2 The connection handle 52 connect, as shown in fig. 6, runner block 6 can use annular disk, 6 bottom of runner block has been provided at circumferentially spaced for supplying The top fixed column 41 of arc shaped blade 4 carries out the radial groove 61 of radial motion.Control stick 3 is adjusted to move along slideway opening 13 It controls arc shaped blade 4 to move in radial groove 61, and then changes the aperture in iris center light passing region.

In a preferred embodiment, the length of the ring structure 32 of the present embodiment is about 4mm, and ring structure 32 is used In being attached fixation with projector projection lens.

Projector's light modulation lens assembly based on the utility model is described in detail combined with specific embodiments below to not With the method that function vision is tested under level conditions, including the following contents:

1, the light passing bore dia of measurement test projector's projection facility, production can be thrown with test with projector The light modulation camera lens inlaying device that shadow camera lens is connected, specifically:

Firstly, the internal diameter of measurement inlaying device 1, makes according to the size of inlaying device 1 and adjusts control stick 3 and lid 3, and accordingly make arc shaped blade 4, blade fixed disk 5 and the runner block 6 of light passing amount control device；Then, by inlaying device 1, Light passing amount control device, adjusting control stick 2 and lid 3 are installed；It is finally that the ring structure 32 for dimming lens assembly is fixed It is connected on the light hole of projector's projection facility light emitting device.

2, observe whether arc shaped blade 4 can normally open and close to adjust by the adjusting control stick 2 of sliding light modulation camera lens Light passing regional diameter enters test if arc shaped blade 4 can be opened and closed normally, if arc shaped blade 4 cannot be opened and closed normally, Light modulation lens assembly is checked, until arc shaped blade 4 can be opened and closed normally, into test.

3, the adjusting control stick 2 of sliding light modulation camera lens makes arc shaped blade 4 be in complete open state, camera lens light passing region The diameter state for not limiting light passing consistent with visual chart projection facility light passing bore dia regard under normal luminance to subject Sensitivity test suggests that right and left eyes and eyes are tested respectively when test, records test result, and measure projection with illumination photometer and form view Target pattern centre illumination, records the brightness value.

4, slidable adjustment control stick 2 makes light passing amount control device reduce light passing region, is needed to select sighting target according to test Grade, test subject is it can be found that the minimal illumination of a certain grade sighting target and can recognize the minimum photograph of a certain grade sighting target Degree records test result, detailed process are as follows:

Using in projector's remote controler projection Snellen visual chart the minimum level-one that can recognize of those who are investigated at The adjusting control stick of row sighting target, sliding light modulation camera lens gathers arc shaped blade 4 gradually to center, reduces the transparent zone of light modulation camera lens To being almost closed, reverse slide dims the adjusting control stick 2 of camera lens in domain, is gradually increased the light passing region of light modulation camera lens.

It is required that subject examines the sighting target of projection, examiner, examiner are notified immediately when discovery has sighting target to occur Stop adjusting the operation of control stick 2, the brightness value in illumination photometer record sighting target pattern center at this time, this brightness value for subject just It can be found that the brightness value of the grade sighting target.

Whether inquiry subject can recognize the direction of sighting target, and subject is recorded if it can correctly recognize can both send out Now the sighting target of the grade can also correctly recognize the brightness value of sighting target；If subject can not recognize sighting target direction, need after Continuous stir adjusts the increase of control stick 2 light passing region, until subject can correctly recognize sighting target, stopping slidable adjustment control stick 2 And the brightness value in sighting target center this moment is recorded with illumination photometer；Above-mentioned brightness value is that subject can reach its best visual acuity most Low-light (level) value, it is proposed that subject's surroundings illumination keeps best vision not less than the brightness value, avoids illumination condition not It is inconvenient and dangerous caused by visual acuity decline when good.

Such as: when visual acuity (Snellen visual chart) is equal to 0.5 to subject under the conditions of normal luminance, project eyesight Table remote controler shows the sighting target of embarking on journey of 0.5 grade in Snellen visual chart, and the adjusting control stick 2 of sliding light modulation camera lens makes arc Blade 4 is gradually gathered to center, reduces the light passing region of light modulation lens assembly to being almost closed, reverse slide dims the tune of camera lens Control stick 2 is saved, light passing region is gradually increased, it is desirable that subject examines the sighting target of projection, stands when discovery has sighting target to occur Examiner, examiner is notified to stop adjusting the operation of control stick, illumination photometer records the brightness value in sighting target pattern center at this time, this Brightness value is the brightness value that subject just can be found that the 0.5 grade sighting target.Whether inquiry subject can recognize sighting target Direction records subject if it can correctly recognize and had not only can be found that the sighting target of the grade but also can correctly recognize the photograph of sighting target Angle value；If subject can not recognize sighting target direction, slidable adjustment control stick 2 need to be continued to open big light passing region, until suffering from Person can correctly recognize sighting target, stop the brightness value for adjusting the operation of control stick 2 and recording sighting target center this moment with illumination photometer, should Brightness value is the minimal illumination value that subject can reach 0.5 grade visual acuity of Snellen visual chart；It is recommended that the daily ring of subject Border illumination can remain able to the minimal visual acuity standard for meeting daily life Activities not less than the brightness value.

In a preferred embodiment, test result may include subject's eye not (left eye, right eye and eyes), dioptric State, the minimal illumination (lux) most preferably corrected defects of vision (BCVA), find BCVA sighting target, the minimal illumination for identifying BCVA sighting target (lux) and suggest environment minimal illumination.

In conclusion projector's light passing lens assembly of the adjustable sighting target surface illuminance using the utility model, Can according to test purpose adjust sighting target grade (such as adjustment sighting target grade be low visual acuity grade scale Snellen visual chart 0.3 grade), so that test obtains the level of minimal illumination needed for subject reaches a certain eyesight rank, according to assessment result pair Minimum ambient lighting conditions in subject's life provide certain suggestion.

The various embodiments described above are merely to illustrate the utility model, wherein the structure of each component, connection type and manufacture craft Etc. may be changed, all equivalents and improvement carried out on the basis of technical solutions of the utility model, It should not exclude except the protection scope of the utility model.

Claims (6)

1. a kind of projector of adjustable sighting target surface illuminance dims lens assembly, which is characterized in that light modulation camera lens dress It sets including inlaying device, light passing amount control device, adjust control stick and lid；

The inlaying device center offers consistent reach through hole, corresponding to the position through through-hole, the inlaying device top Portion offers the annular groove for being embedded the light passing amount control device；

Corresponding to the position of the annular groove, the side of the inlaying device is offered for carrying out arc for the adjusting control stick The slideway opening of shape movement；

It is fixedly connected with the lid at the top of the inlaying device, offers light hole at the top of the lid, corresponds to described logical The position of unthreaded hole, the cover center, which extends outward, is provided with one for being attached fixation with projector projection lens Ring structure.

2. the projector of adjustable sighting target surface illuminance dims lens assembly as described in claim 1, which is characterized in that The light passing amount control device includes arc shaped blade, blade fixed disk and runner block, and the blade fixed disk is fixed at institute It states in annular groove, the runner block is fixed in the lid.

3. the projector of adjustable sighting target surface illuminance dims lens assembly as claimed in claim 2, which is characterized in that The arc shaped blade uses several sizes, the identical thin metal arc shaped blade of structure, and the arc shaped blade integrally opens and closes formation and connects The light passing region of subcircular, one end of each arc shaped blade upwardly extend one top fixed column of setting, each arc The other end of shape blade extends downward with a lower part fixed column.

4. the projector of adjustable sighting target surface illuminance dims lens assembly as claimed in claim 3, which is characterized in that The blade fixed disk uses annular sheet metal, is circumferentially equidistantly provided in the blade fixed disk for wearing the lower part The location hole of fixed column, all arc shaped blade arrangements make the arc shaped blade entirely cover the blade fixed disk in imbricate Ring discoid region, the outer end of the blade fixed disk, which further extends outward to be provided with, adjusts what control stick was fixedly connected with described Connection handle.

5. the projector of adjustable sighting target surface illuminance as described in claim 3 or 4 dims lens assembly, feature exists In the runner block uses annular disk, and the runner block bottom has been provided at circumferentially spaced for carrying out for the top fixed column The radial groove of radial motion, the adjusting control stick control the arc shaped blade in the diameter along the slideway harness motion To concave slot sports, and then change the size in light passing region.

6. the projector of adjustable sighting target surface illuminance dims lens assembly as described in claim 1, which is characterized in that The ring structure and the accessible length of projector's projection lens are 4mm.