CN1184948A - Optical system of low power projection instrument - Google Patents
Optical system of low power projection instrument Download PDFInfo
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- CN1184948A CN1184948A CN96117205A CN96117205A CN1184948A CN 1184948 A CN1184948 A CN 1184948A CN 96117205 A CN96117205 A CN 96117205A CN 96117205 A CN96117205 A CN 96117205A CN 1184948 A CN1184948 A CN 1184948A
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- optical system
- low power
- projection
- plane mirror
- projection instrument
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Abstract
The optical system of low fold projector is composed of transparent glass plate, plane reflector, projection objective lens. The optical system makes the object on the transparent glass plate to form an enlarged image on a wall.
Description
The present invention is optical system of low power projection instrument, the picture that it extremely helps people to watch object to be exaggerated easily.
Present employed projector enlargement ratio is 3 times to 8 times, with PLUSDP-30 is example, 3 meters of 8 times of projector distances, 1 meter of 3 times of projector distance, it is applicable to the occasion of large contingent, its power consumption is 1200 watts, because the needed luminous energy of projector projection is square being inversely proportional to of magnification, therefore only needs 170W 3 times the time.People must be in the projection image of seeing object greater than the distance of projector distance after the projector projection, and indoor 0.5 meter * 0.5 meter TV screen has belonged to rarely, and therefore, present 3-8 times projector can not be used for the needs of general family and office.
The objective of the invention is to be to provide a kind of optical system of low power projection instrument, the usefulness of reading newspaper when the old man has farsightedness in the family more can be used as the usefulness of the factories and miness enterprises and institutions mini-session projection of mini-session.Because projector distance is only 560 millimeters in the time of 3.5 times, therefore being equivalent to the distance of distinct vision is 2 x magnifications.Often use to help to prevent bathomorphic generation, can solve the difficulty that the farsightedness reading is read newspaper simultaneously; The incorrect correction of reading sitting posture when more helping to learn.
The present invention is achieved by the following technical solutions:
The present invention is an optical system of low power projection instrument, is sequentially arranged on the light path with projection objective (2) by transparency glass plate (4), plane mirror (3) and forms (Fig. 1).Reflective mirror in paper plane (3) inverted image once adds object lens (2) inverted image once.Therefore on projection screen (14) picture of upright object (1).In order in perpendicular to paper plane, also to form erect image, plane mirror (3) can use roof prism (5) to substitute, also can (Fig. 3) substitute and to achieve the goal with the secondary reflection level crossing (6) that is mutually the right angle, projection objective (2) can be two cemented objective (tables one, table two), also can be that three simple lenses (table three, table four) are formed.
The light that lighting source (16) sends, seeing through transparency glass plate (4) throws light on afterwards and is projected object (1), make that be projected object (1) becomes a luminophor and emit beam through transparency glass plate (4) outgoing, reflect refraction projection object lens (2) afterwards through plane mirror (3) again, the beam projecting of process projection objective (2) is on projection screen (14), forming one is erect image at paper plane, is the mirror image (14) of inverted image perpendicular to paper plane.In order to obtain a complete erect image plane mirror thereby will to substitute with roof prism (5) or with the secondary reflection level crossing (6) that is mutually the right angle.
Object (1) is far away from projection objective (2) as seen from Figure 4; among the screen in the practicality (14) heart should with object (1) in a plane in order to avoid cause screen (14) to ring the clear of imaging on the screen for the oblique-angle projection face; the height that should force down whole instrument on the other hand is to reduce volume; the center of gravity of lowering apparatus; design plane reflective mirror (8) again between plane mirror (3) and transparency glass plate (4) for this reason; on projection objective then design protection glass (12) be mutually the secondary reflection plane mirror (15) at right angle so that the light level outgoing of instrument and be projected object (1) and place basically on the level.
Fig. 9 is exactly the variation of the design of Fig. 5 for the another kind of version of the present invention's optical system of low power projection instrument, and its difference is to make plane mirror (3) to turn over turnback with its later optical system in perpendicular to paper plane and gets.
The present invention's advantage is shape usually the high power projector is little also corresponding minimizings of a lot of its energy consumptions outside this kind optical system, be reduced to 150W by 1200W, can satisfy the demand, projector distance is 560 millimeters, lateral magnification can reach 3.5 times, and lateral magnification is 3 times during 1 meter of projector in city distance, and relatively magnification doubles with it, 250 millimeters is 1 times from the magnification of eyepiece, then answer 560 millimeters the time 0.45 times and visual field also than eyepiece for big.
One of Fig. 1 optical system of low power projection instrument figure.
The prism of Fig. 2 Fig. 1 (5) substitutes plane mirror (3) figure.
The secondary reflection level crossing (6) of Fig. 3 Fig. 1 substitutes plane mirror (3) figure.
The optical system structure dimensional drawing of Fig. 4 Fig. 1.
Two of Fig. 5 optical system of low power projection instrument figure.
The secondary reflection level crossing (6) of Fig. 6 Fig. 5 substitutes plane mirror (3) figure.
The system of Fig. 7 Fig. 5 substitutes secondary reflection level crossing (15) figure with roof prism (7).
The optical system structure dimensional drawing of Fig. 8 Fig. 5.
Three of the optical system diagram of Fig. 9 low power projection.
The optical system structure dimensional drawing of Figure 10 Fig. 9.
Embodiment 1 optical system of low power projection instrument: Fig. 1 has projection objective (2) plane mirror (3), and transparency glass plate (4) is sequentially arranged on the light path.Projection screen (14) and object (1) are placed in outside the optical system, and plane mirror (3) forms an erect image on projection screen (14) with roof prism (5) or secondary reflection level crossing (6), the object of this optical system (1).Fig. 4 is the optical system structure dimensional drawing, and table 1-table 4 is its optical system inner structure size table.
Embodiment 3 optical system of low power projection instrument: Fig. 9 has projection objective (2), plane mirror (8), plane mirror (3), projection objective (2), transparency glass plate (4), the secondary reflection level crossing (15) that is mutually the right angle and cover glass (12) to be sequentially arranged on the light path to form.Object (1) through plane mirror (8), plane mirror (3) afterwards, at paper plane with do not change the relativeness of mirror before in perpendicular to paper plane.Object in paper plane (1) becomes an inverted image again through the secondary reflection level crossing inverted image that is mutually the right angle once through projection objective (2), becomes an erect image on projection screen (14).Perpendicular to paper plane as with paper plane in picture, through object lens (2) and the secondary reflection level crossing (15) that is mutually the right angle more once as, thereby whole optical system becomes an erect image on projection screen (14).Figure 10 is the optical system structure dimensional drawing of present embodiment.Table 1-table 4 is its optical system inner structure size table.One of table 1 projection objective (2) parameter image distance: 560 millimeters object distances: 162.69 millimeters linear fields: 68.284 millimeters
Focal length: 129.24 millimeters aperture angles: 3.48
Two image distances of table 2 projection objective (2) parameter: 450 millimeters object distances: 162.69 millimeters linear fields: 84.939 millimeters
| Title | Radius-of-curvature (MM) | Thickness (MM) | The glass trade mark | |
| Two cemented objectives | Negative lens | 465.32 | ||
| ????2 | ????2F1 | |||
| 60.827 | ||||
| Positive lens | ||||
| ????6 | ????K9 | |||
| -60.827 | ||||
Focal length: 122.30 millimeters aperture angles: 2.79
Table 3 projection objective (2) ginseng no ter image distance: 560 millimeters object distances: 158.29 millimeters linear fields: 67.685 millimeters
| Title | Radius-of-curvature (MM) | Thickness (MM) | The glass trade mark | |
| Two cemented objectives | Negative lens | ????424.72 | ||
| ????2 | ????2F1 | |||
| ????58.01 | ||||
| Positive lens | ||||
| ????6 | ????K9 | |||
| ????-58.01 | ||||
Focal length: 129.24 millimeters aperture angles: 3.51
The four-quadrant distance of table 4 projection objective (2) parameter: 400 millimeters object distances: 158.29 millimeters linear fields: 67.685 millimeters
| Title | Radius-of-curvature (MM) | Thickness (MM) | The glass trade mark |
| Positive lens 2-3 | ??51.241 | ||
| ????4 | ????2K8 | ||
| ??-172.03 | |||
| ????3 | |||
| Negative lens 2-2 | |||
| ??-33.427 | |||
| ????2 | ????F5 | ||
| ??148.67 | |||
| Positive lens 2-1 | |||
| ????3 | |||
| ??-77.273 | |||
| ????3.5 | ????2K8 | ||
| ??-28.512 |
Focal length: 118.51 millimeters aperture angles: 2.95
| Title | Radius-of-curvature (MM) | Thickness (MM) | The glass trade mark |
| Positive lens 2-3 | ??47.578 | ||
| ????4 | ????2K8 | ||
| ??-159.73 | |||
| ????3 | |||
| Negative lens 2-2 | |||
| ??-31.037 | |||
| ????2 | ????F5 | ||
| ??138.04 | |||
| Positive lens 2-1 | |||
| ????3 | |||
| ??-71.749 | |||
| ????3.5 | ????2K8 | ||
| ??-26.474 |
Claims (7)
1, a kind of optical system of low power projection instrument, it has projection objective (2), it is characterized in that transparency glass plate is arranged (4), plane mirror (3), projection objective (2) is sequentially arranged on the light path.
2, optical system of low power projection instrument according to claim 1 is characterized in that plane mirror (3) substitutes with roof prism (5).
3, optical system of low power projection instrument according to claim 1 is characterized in that flat picture reflective mirror (3) substitutes with the secondary reflection level crossing (6) that is mutually the right angle.
4, optical system of low power projection instrument according to claim 1 is characterized in that between plane mirror (3) and the transparency glass plate (4) plane mirror (8) being arranged.
5, optical system of low power projection instrument according to claim 1, the secondary reflection level crossing (15) that it is characterized in that cover glass (12) is arranged between projection objective (2) and the projection screen (14) Yu be mutually the right angle.
6,, it is characterized in that the secondary reflection level crossing (15) that is mutually the right angle substitutes with roof prism (7) according to claim 1 and 5 described optical system of low power projection instrument.
7, optical system of low power projection instrument according to claim 1 is characterized in that the common outside at transparency glass plate and plane mirror (3) is by being equipped with lighting source (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117205A CN1184948A (en) | 1996-12-09 | 1996-12-09 | Optical system of low power projection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117205A CN1184948A (en) | 1996-12-09 | 1996-12-09 | Optical system of low power projection instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1184948A true CN1184948A (en) | 1998-06-17 |
Family
ID=5124137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117205A Pending CN1184948A (en) | 1996-12-09 | 1996-12-09 | Optical system of low power projection instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1184948A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789053A (en) * | 2012-09-04 | 2012-11-21 | 王凯 | Remote reading device for alleviating visual fatigue |
-
1996
- 1996-12-09 CN CN96117205A patent/CN1184948A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789053A (en) * | 2012-09-04 | 2012-11-21 | 王凯 | Remote reading device for alleviating visual fatigue |
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