Pattern generating device and its application

Abstract

A pattern generating device, characterized in that it includes a light source, an illumination lens group, a first imaging lens group, a second imaging lens group, a pattern plate, a third imaging lens group and an image sensor in sequence, the first imaging lens group and the third imaging lens group have the same focal length, aperture and field angle, the angle of incident light of the second imaging lens group is the same as the angle of outgoing light of the second imaging lens group, the pattern plate is located on the object plane of the third imaging lens group, and the image sensor is located on the image plane of the third imaging lens group. The present invention also discloses the application of the pattern generating device in a vehicle-mounted projection lamp. The generated logo pattern has the advantages of high definition, high contrast and high brightness.

Description

Technical Field

[0001] The invention relates to a device for obtaining a pattern through lens projection, and also relates to the application of the device in a vehicle-mounted projection lamp. Background Art

[0002] The existing factors of vehicle-mounted projection lamps, such as tilted projection, lens processing errors, stray light of the projection system, and distortion of the projection lens, make the relationship between the logo pattern and the ground projection pattern complicated. Therefore, eliminating the influencing factors such as tilted projection, lens processing errors, stray light of the projection system, and distortion of the imaging lens, and obtaining an intuitive correspondence between the logo pattern and the ground pattern is one of the key technologies of vehicle-mounted projection lamps.

[0003] Reference application number 201710733043.4 Chinese invention patent application disclosed "A slide with oblique projection, a method for making the same, and a projection lens" (application publication number CN 107329354 A), which discloses a slide with oblique projection, a method for making the same, and a projection lens, wherein the method for making the slide with oblique projection includes the following steps: S1, establishing a projection model according to the required projection field of view, the installation position of the projection lens, and the field of view angle of the projection lens; S2, making a sensor surface perpendicular to the optical axis of the projection lens in the projection model, and placing the actual image to be obtained within the projection field of view; S3, projecting the actual image within the projection field of view onto the sensor surface using a reverse projection method; S4, scaling and adjusting the image on the sensor surface, and transferring it to the slide to make the slide. According to steps S1-S4, the pattern on the logo can be generated. However, in step S3, the actual image within the projection field is projected onto the sensor surface by the reverse projection method of the first projection method. The reverse projection method of the first projection method cannot eliminate the influence of the distortion of the projection lens, lens processing error, stray light, etc. Moreover, after the actual pattern is projected onto the sensor by step 3, it needs to be adjusted and scaled by step 4 to obtain the final projection pattern. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a pattern generating device for eliminating factors such as tilted projection, processing errors, stray light, distortion, etc. of the imaging lens in response to the above-mentioned technical status quo, so as to obtain an intuitive, high-definition, high-contrast, and high-brightness logo pattern.

[0005] The second technical problem to be solved by the present invention is to provide a vehicle-mounted projection lamp application that can produce a ground projection pattern with high brightness, high definition, high uniformity, no distortion, and no stray light.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a pattern generating device, characterized in that it includes a light source, an illumination lens group, a first imaging lens group, a second imaging lens group, a pattern plate, a third imaging lens group and an image sensor in sequence. The light emitted by the aforementioned light source passes through the illumination lens group, the first imaging lens group and the second imaging lens group in sequence, and then forms a uniform illumination spot on the pattern plate, and finally is imaged on the pattern sensor through the third imaging lens group. The aforementioned first imaging lens group and the third imaging lens group have the same focal length, aperture and field angle, the angle of the incident light of the second imaging lens group is the same as the angle of the outgoing light of the second imaging lens group, the aforementioned pattern plate is located on the object plane of the third imaging lens group, and the aforementioned image sensor is located on the image plane of the third imaging lens group.

[0007] Furthermore, the spatial angles of the pattern plate are α, β, and γ, wherein α represents the angle between the pattern plate and the YZ plane, β represents the angle between the pattern plate and the XZ plane, and γ represents the angle between the pattern plate and the XY plane, and satisfies 0°<α≦90°, 0°<β≦90°, and 0°<γ≦90°.

[0008] Preferably, the number of optical lenses of the illumination lens group, the first imaging lens group, the second imaging lens group or the third imaging lens group is ≧1, and the optical lenses are optical plastic or optical glass, and the surface shape of the optical lenses is spherical, aspherical, free-form or microlens array surface.

[0009] Preferably, the surface shape of the third imaging lens group is an actually processed surface shape.

[0010] Preferably, the illumination lens group comprises a first illumination lens and a second illumination lens in sequence, the light incident surface of the first illumination lens is a vertical mirror surface, the light exit surface is a convex lens, and the light incident surface and light exit surface of the second illumination lens are both convex lenses.

[0011] Preferably, the third imaging lens group includes a first imaging lens, a second imaging lens and a third imaging lens in sequence, the light incident surface and the light exit surface of the first imaging lens are both convex lenses, the light incident surface and the light exit surface of the second imaging lens are both concave lenses, and the light incident surface and the light exit surface of the third imaging lens are both convex lenses.

[0012] Preferably, the pattern plate is made of black light-absorbing material.

[0013] The technical solution adopted by the present invention to solve the above second technical problem is: application of the pattern generating device to the vehicle-mounted projection lamp.

[0014] Compared with the prior art, the advantages of the present invention are: multiple imaging lens groups are used to directly image the logo pattern on the pattern sensor, and there is a one-to-one correspondence between the logo pattern and the pattern plate. Ultimately, factors such as tilted projection, processing errors, stray light, and distortion of the imaging lens can be eliminated, thereby obtaining an intuitive, high-definition, high-contrast, and high-brightness logo pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an embodiment.

[0016] Figure 2 for Figure 1 Magnified view of the middle illumination lens group.

[0017] Figure 3 for Figure 1 An enlarged view of the third imaging lens group.

[0018] Figure 4 for Figure 1 Schematic diagram of the spatial angle of the surface where the pattern plate is located.

[0019] Figure 5 It is a ground pattern applied to vehicle-mounted projection when α is 90°, β is 0, and γ is 0 in the embodiment.

[0020] Figure 6 In the embodiment, α is 90°, β is 0, and γ is 0 and applied to the corresponding logo piece in the vehicle-mounted projection.

[0021] Figure 7 It is a ground pattern applied to vehicle-mounted projection when α is 62°, β is 0, and γ is 0 in the embodiment.

[0022] Figure 8 In the embodiment, α is 62°, β is 0, and γ is 0, which is applied to the corresponding logo piece in the vehicle-mounted projection. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1As shown, the pattern generating device in this embodiment includes a light source 4, an illumination lens group 5, a first imaging lens group 1, a second imaging lens group 2, a pattern plate 6, a third imaging lens group 3 and an image sensor 7 in sequence. The light emitted by the light source 4 passes through the illumination lens group 5, the first imaging lens group 1 and the second imaging lens group 2 in sequence, and then forms a uniform illumination spot on the pattern plate 6, and finally forms an image on the pattern sensor through the third imaging lens group 3. The focal length, aperture and field angle of the first imaging lens group 1 and the third imaging lens group 3 are the same, the angle of the incident light of the second imaging lens group 2 is the same as the angle of the outgoing light of the second imaging lens group 2, the pattern plate 6 is located on the object plane of the third imaging lens group 3, and the image sensor 7 is located on the image plane of the third imaging lens group 3. The pattern plate 6 in this embodiment is made of a black light-absorbing material.

[0025] The number of optical lenses of the illumination lens group 5, the first imaging lens group 1, the second imaging lens group 2 or the third imaging lens group 3 is ≧1, and the optical lenses are optical plastic or optical glass, and the surface shape of the optical lenses is spherical, aspherical, free-form or microlens array surface.

[0026] Combination Figure 2 As shown, the illumination lens group 5 in this embodiment includes a first illumination lens 51 and a second illumination lens 52 in sequence. The light incident surface of the first illumination lens 51 is a vertical mirror surface, and the light emitting surface is a convex lens. The light incident surface and the light emitting surface of the second illumination lens 52 are both convex lenses.

[0027] like Figure 3 As shown, the third imaging lens group 3 in this embodiment includes a first imaging lens 31, a second imaging lens 32 and a third imaging lens 33 in sequence, the light incident surface and the light exit surface of the first imaging lens 31 are both convex lenses, the light incident surface and the light exit surface of the second imaging lens 32 are both concave lenses, and the light incident surface and the light exit surface of the third imaging lens 33 are both convex lenses. The first imaging lens group and the second imaging lens group can be arranged with reference to the third imaging lens group.

[0028] Combination Figure 4 As shown, the spatial angles of the pattern plate 6 are α, β, and γ, wherein α represents the angle between the pattern plate 6 and the YZ plane, β represents the angle between the pattern plate 6 and the XZ plane, and γ represents the angle between the pattern plate 6 and the XY plane, and satisfies 0°<α≦90°, 0°<β≦90°, and 0°<γ≦90°.

[0029] Combination Figures 4 to 8 As shown, for the same ground pattern, the pattern generated on the logo piece will be different if the placement angle and position are different; by using the pattern generating device of the present invention, given the ground pattern and the corresponding α, β, γ, a one-to-one correspondence between the ground pattern and the pattern on the logo piece can be obtained.

Claims

1. A pattern generating device, characterized in that The invention comprises a light source (4), an illumination lens group (5), a first imaging lens group (1), a second imaging lens group (2), a pattern plate (6), a third imaging lens group (3) and an image sensor (7) in sequence. The light emitted by the light source (4) passes through the illumination lens group (5), the first imaging lens group (1) and the second imaging lens group (2) in sequence, and then forms a uniform illumination spot on the pattern plate (6). Finally, the light is imaged on the pattern sensor through the third imaging lens group (3). The first imaging lens group (1) and the third imaging lens group (3) have the same focal length, aperture and field angle. The angle of the incident light of the second imaging lens group (2) is the same as the angle of the outgoing light of the second imaging lens group (2). The pattern plate (6) is located on the object plane of the third imaging lens group (3), and the image sensor (7) is located on the image plane of the third imaging lens group (3).

2. The pattern generating device according to claim 1, characterized in that The number of optical lenses in the illumination lens group (5), the first imaging lens group (1), the second imaging lens group (2) or the third imaging lens group (3) is ≧1.

3. The pattern generating device according to claim 2, characterized in that The optical lens is made of optical plastic or optical glass.

4. The pattern generating device according to claim 2, characterized in that The surface shape of the optical lens is a spherical surface, an aspherical surface, a free-form surface or a microlens array surface.

5. The pattern generating device according to claim 2, characterized in that The illumination lens group (5) comprises a first illumination lens (51) and a second illumination lens (52) in sequence, the light incident surface of the first illumination lens (51) being a vertical mirror surface, and the light exit surface being a convex lens, and the light incident surface and light exit surface of the second illumination lens (52) being both convex lenses.

6. The pattern generating device according to claim 2, characterized in that The third imaging lens group (3) comprises a first imaging lens (31), a second imaging lens (32) and a third imaging lens (33) in sequence, wherein the light incident surface and the light exit surface of the first imaging lens (31) are both convex lenses, the light incident surface and the light exit surface of the second imaging lens (32) are both concave lenses, and the light incident surface and the light exit surface of the third imaging lens (33) are both convex lenses.

7. The pattern generating device according to claim 1, characterized in that The pattern plate (6) is made of black light-absorbing material.

8. Application of the pattern generating device according to any one of claims 1 to 7 in a vehicle-mounted projection lamp.

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