CN201000504Y

CN201000504Y - Novel optical system for peephole and peephole thereof

Info

Publication number: CN201000504Y
Application number: CNU2006201194363U
Authority: CN
Inventors: 邵文才
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-08
Filing date: 2006-09-08
Publication date: 2008-01-02
Anticipated expiration: 2016-09-08

Abstract

The utility model provides an optical system for the door mirror, which comprises an object lens arranged outside of a door and an eye lens arranged inside of a door. The object lens is a concave lens, the eye lens is a convex lens, and the utility model is characterized in that the object lens also comprises a or a set of auxiliary concave lens arranged concentrically with the concave lens. The utility model also provides a door mirror applying the optical system. The optical system and the door mirror of the utility model have the advantages that the field angle is large, and the utility models are suitable for doors in various specifications and thickness.

Description

A kind of novel peephole is used up system and peephole thereof

Technical field

The utility model relates to optical imaging system, particularly relates to a kind of novel optical system that can be used for peephole and peephole thereof, and described optical system and peephole can effectively be applicable to thick door, and have bigger field angle.

Background technology

Peephole is commonly called as " cat's eye ", its structure of tradition peephole is very simple, generally form by two groups of lens, outer side of door be the concavees lens groups, what door was inboard is the convex lens groups, when by peephole outwards seeing field angle outdoors clearly and be about all scenes in 120 ℃ of scopes from indoor, and from seeing indoor anything by peephole outdoors.If on the gate in room, load onto this mirror, can before opening the door, individual grasp roughly be arranged to the sight before the door, particularly for those safety cases relatively poor area or environment, especially when having only old man and child in the family, can effectively prevent to be deceived out door by those strangers that have an ulterior motive, cause unnecessary loss or tragedy, therefore, peephole all can be brought into play very important effect for the antitheft and safety of most of families.

Its optical principle is: peephole is to be formed by two combination of lensess.When we just see, when promptly in door, outwards seeing, object lens L1 is concavees lens (divergent lenses), eyepiece L2 be convex lens (convergent lens) (light path is seen Fig. 2 a). the focal length of object lens L1 is extremely short, it becomes a upright virtual image A ' B ' who contracts very for a short time with outdoor people or thing AB, this picture just in time drops within first focus of eyepiece L2, L2 plays a part magnifier, obtain a upright virtual image A " B " who comparatively amplifies at last, this picture just becomes again near the distance of distinct vision of human eye, situation for has outdoors just seen clearly Chu.

When seeing (light path is seen Fig. 2 b), L1 has become eyepiece, L2 has then become object lens, indoor people or thing AB should generate the real image A ' B ' of handstand by the deflecting light beams behind the convergent lens L2, but just not fall on the divergent lens L1 before the imaging as yet, because the focal length of L1 is extremely short, the upright virtual image A " B " that obtains at last is very near apart from eyepiece L1, has only 2～3cm, again because the aperture of peephole is very little, the outdoor people eyepiece L1 that has to press close to watches, like this, the distance between human eye and picture A " B ", also 2～3cm only, (near point is the minor increment that human eye can be seen object clearly to this distance less than normal eye's near point, growth with people's age increases, the about 10cm of normal young people's near point, but during by 50 years old, near point roughly increases to 40cm), therefore, for outdoor Peeping Tom, indoor all are ambiguous.

Existing peephole optical system, only be only applicable to traditional thin door, still, along with science and technology and expanding economy, the 40mm-50mm thickness door in past is replaced by 70-80mm thickness even 120mm thickness door gradually, and traditional peephole optical system more and more is not suitable for modern thick door and uses; Secondly, existing peephole optical system, generally all be confined to 120 ℃ of scopes even be applied to existing its field angle of thin door, that is to say, along people or the object in each 30 ℃ of scope of door both sides, indoor people can not observe by peephole, and this just provides opportunity for the people that those are hatched a sinister plot, and have stayed dangerous hidden danger.

The utility model content

At defective and the deficiency that existing peephole optical system exists, the purpose of this utility model is to provide a kind of novel peephole optical system and peephole thereof, and this optical system and peephole are applicable to thick door and have bigger field angle.

The technical solution of the utility model is as follows:

A kind of peephole optical system, comprise the object lens and the inboard eyepiece of door that are arranged at outer side of door, described eyepiece is convex lens, and described object lens are concavees lens, it is characterized in that: described object lens also comprise the auxiliary concavees lens of or a group and the concentric setting of described concavees lens.

Length-diameter ratio between described eyepiece and the object lens was more than or equal to 1: 200.

Described auxiliary concavees lens constitute for being arranged in turn by two or more half concavees lens.

Be provided with spacing between described half and half concavees lens.

Described spacing is less than the focal length of these half concavees lens.

The parameters of described optical system is:

R D ND Φ

1 .0000 .0000 1.000000

2 251.4000 -1.1000 1.000000 21

3 10.0000 1.3000 1.491000 13

4 .0000 2.5000 1.000000 13

5 12.5000 1.3000 1.491000 10

6 -12.5000 2.1000 1.000000 10

7 .0000 .9000 1.491000 10

8 .0000 36.4000 1.000000 10

9 -25.0000 1.5000 1.491000 10

10 .0000 .0000 1.000000

Wherein, R is each lens surface radius, and D is a spacing between each face of lens, and ND is a refractive index, and Ф is a diameter.

The parameters of described optical system is:

R D ND Ф

1 .0000 .0000 1.000000

2 251.4000 -.9000 1.000000 23

3 11.4020 1.2000 1.491000 15

4 .0000 3.0000 1.000000 15

5 14.2230 1.3000 1.491000 12

6 -14.2230 2.6500 1.000000 12

7 .0?000 1.0000 1.491000 12

8 .0000 38.0000 1.000000 12

9 -26.6300 1.5000 1.491000 12

10 .0000 .0000 1.000000

Described lens material is a polymetylmethacrylate.

A kind of application has the peephole of aforesaid optical system, it is characterized in that: described peephole includes aforesaid optical system.

Technique effect of the present utility model is:

By object lens inboard one or one group of concave lens concentric with it are set,, make the length of optical system extend on the one hand, to adapt to the needs of thick door by the disperse function of these concavees lens in existing peephole optical system; On the other hand, by concavees lens or the concavees lens assembly of setting up, feasible concavees lens group as eyepiece has littler focal length, improves the performance of dispersing of eyepiece, has correspondingly enlarged the field angle of peephole.

The peephole of the above-mentioned optical system of employing provided by the utility model has corresponding characteristics equally.

Description of drawings

Fig. 1 is an optical system structure synoptic diagram of the present utility model;

Fig. 2 a is the optical schematic diagram of traditional peephole;

Fig. 2 b is the optical schematic diagram of traditional peephole.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

Be illustrated in figure 1 as a kind of optical system structure synoptic diagram of the present utility model.Lens 1 are the outermost concavees lens of peephole (object lens), lens 4 are the convex lens (eyepiece) of peephole opposite side, lens 2 and lens 3 are for being arranged at the auxiliary concavees lens between lens 1 and the lens 4 with one heart, the setting of this auxiliary concavees lens group, the length that both can increase the peephole optical system is to adapt to the needs of thick door, can further dwindle the focal length of objective lens again, improve the field angle of peephole optical system, improve the performance of peephole.

Lens 2 shown in Figure 1 and lens 3 are as a kind of frame mode of present embodiment, its circular arc plane of refraction forward is oppositely arranged, certainly lens 2 and lens 3 also can be replaced by other multi-form concavees lens or concavees lens group, are oppositely arranged or directly adopt structures such as double concave lens dorsad as the circular arc plane of refraction with lens 2 and lens 3.

Embodiment 1: the geometrical optics parameter of the utility model optical system is as follows:

R D ND Ф

1 .0000 .0000 1.000000

2 251.4000 -1.1000 1.000000 21

3 10.0000 1.3000 1.491000 13

4 .0000 2.5000 1.000000 13

5 12.5000 1.3000 1.491000 10

6 -12.5000 2.1000 1.000000 10

7 .0000 .9000 1.491000 10

8 .0000 36.4000 1.000000 10

9 -25.0000 1.5000 1.491000 10

10 .0000 .0000 1.000000

Embodiment 2: the geometrical optics parameter of the utility model optical system is as follows:

R D ND Ф

1 .0000 .0000 1.000000

2 251.4000 -.9000 1.000000 23

3 11.4020 1.2000 1.491000 15

4 .0000 3.0000 1.000000 15

5 14.2230 1.3000 1.491000 12

6 -14.2230 2.6500 1.000000 12

7 .0000 1.0000 1.491000 12

8 .0000 38.0000 1.000000 12

9 -26.6300 1.5000 1.491000 12

10 .0000 .0000 1.000000

Among above-described two kinds of embodiment, optical lens all adopts the polymetylmethacrylate material preparation, certainly, and for the utility model, this optical system also can adopt other optical materials to make, and just can as long as the geometrical optics parameter of each lens is consistent with said system.

The utility model also provides a kind of peephole that adopts above-mentioned optical system.

The above only is a preferred implementation of the present utility model.Should be pointed out that for a person skilled in the art,, can also make other modification and improvement, but these modification and improvement all will fall into protection domain of the present utility model according to essence of the present utility model.

Claims

1. peephole optical system, comprise the object lens and the inboard eyepiece of door that are arranged at outer side of door, described object lens are concavees lens, and described eyepiece is convex lens, it is characterized in that: described object lens also comprise the auxiliary concavees lens of or a group and the concentric setting of described concavees lens.

2. a kind of peephole optical system as claimed in claim 1, it is characterized in that: the length-diameter ratio between described eyepiece and the object lens was more than or equal to 1: 200.

3. a kind of peephole optical system as claimed in claim 2 is characterized in that: described auxiliary concavees lens constitute for being arranged in turn by two or more half concavees lens.

4. a kind of peephole optical system as claimed in claim 3 is characterized in that: be provided with spacing between described half and half concavees lens.

5. a kind of peephole optical system as claimed in claim 4, it is characterized in that: described spacing is less than the focal length of these half concavees lens.

6. a kind of peephole optical system as claimed in claim 5 is characterized in that: described lens material is a polymetylmethacrylate.

7. an application has the peephole of optical system as claimed in claim 1, and it is characterized in that: described peephole includes optical system as claimed in claim 1.