KR101826718B1 - imaging device - Google Patents

Abstract

An image pickup apparatus is disclosed. The imaging device includes a first imaging unit; And a second imaging unit adjacent to the first imaging unit, wherein the first imaging unit comprises: a first sensor unit; And a plurality of first lenses disposed in correspondence with the first sensor unit, wherein a first diffraction grating is formed on at least one surface of the first lenses, and the second scratch- 2 sensor unit; And a second diffraction grating formed on at least one surface of the second lens, wherein the height of the first diffraction grating is larger than the height of the second diffraction grating different.

Description

[0001]

An embodiment relates to an image pickup apparatus.

2. Description of the Related Art Recently, a compact digital camera or a digital video camera using a solid-state image pickup device such as CCD or CMOS is incorporated in a mobile phone or a mobile communication terminal. Such an imaging device has a tendency to be downsized, and accordingly, an optical system used for an imaging device is required to have high performance and miniaturization.

The conventional optical system includes a first lens, a second lens, a third lens, a fourth lens, a filter, and a light receiving element. At this time, the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side. The first lens and the third lens may have a positive refractive power, and the second lens and the fourth lens may have a negative refractive power. The refractive power of the second lens may be designed to be larger than that of other lenses.

The first lens may have a convex surface on the object side, and the second lens may have a concave surface on the image side. The filter may be an infrared cut filter, and the light receiving element may be a CCD image sensor or a CMOS image sensor.

Such a small optical system is disclosed in Korean Patent Application No. 10-2007-0041825.

The embodiment intends to provide an imaging apparatus with improved performance.

An imaging apparatus according to an embodiment includes a first imaging unit; And a second imaging unit adjacent to the first imaging unit, wherein the first imaging unit comprises: a first sensor unit; And a plurality of first lenses disposed in correspondence with the first sensor unit, wherein a first diffraction grating is formed on at least one surface of the first lenses, and the second scratch- 2 sensor unit; And a second diffraction grating formed on at least one surface of the second lens, wherein the height of the first diffraction grating is larger than the height of the second diffraction grating different.

The imaging apparatus according to the embodiment can form a diffraction grating at different heights for each imaging section. In particular, the first imaging unit and the second imaging unit can take images of different wavelengths. At this time, diffraction gratings suitable for the wavelength band can be applied to the first imaging unit and the second imaging unit.

Therefore, the imaging apparatus according to the embodiment can improve the diffraction efficiency for each wavelength band and effectively suppress the noise.

1 is a view showing an image pickup apparatus according to an embodiment.
Fig. 2 is a diagram showing a cross section of an image pickup apparatus according to the embodiment. Fig.
3 is a sectional view showing the first object-side lens of the first imaging unit.
4 is a sectional view showing the second object-side lens of the second imaging unit.
5 is a cross-sectional view showing a third object-side lens of the third imaging unit.
6 is a cross-sectional view showing the fourth object-side lens of the fourth imaging unit.

In the description of the embodiments, it is to be understood that each lens, unit, section, hole, projection, groove or layer may be referred to as being "on" or "under" each lens, unit, Quot; on "and" under "include both being formed" directly "or" indirectly " . In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a view showing an image pickup apparatus according to an embodiment. Fig. 2 is a diagram showing a cross section of an image pickup apparatus according to the embodiment. Fig. 3 is a sectional view showing the first object-side lens of the first imaging unit. 4 is a sectional view showing the second object-side lens of the second imaging unit. 5 is a cross-sectional view showing a third object-side lens of the third imaging unit. 6 is a cross-sectional view showing the fourth object-side lens of the fourth imaging unit.

1 to 6, an image pickup apparatus according to the embodiment includes a plurality of first image pickup units 10, a plurality of second image pickup units 20, a plurality of third image pickup units 30, And imaging sections (40).

The first imaging units 10, the second imaging units 20, the third imaging units 30, and the fourth imaging units 40 are disposed adjacent to each other. That is, the second imaging units 20 are adjacent to the first imaging units 10, the third imaging units 30 are adjacent to the second imaging units 20, And the units 40 may be adjacent to the third image pickup unit 30, respectively. The first imaging units 10, the second imaging units 20, the third imaging units 30, and the fourth imaging units 40 may be arranged in a matrix.

The first imaging units 10 take images of the first wavelength band. For example, the first imaging units 10 can take a blue image. The first imaging units 10 may sense light of about 400 nm to about 480 nm.

2, the first imaging unit 10 includes a first object-side lens 110, a first intermediate lens 210 and a first image-side lens 310, a first filter unit 410, 1 light receiving portion 510. [

The first object-side lens 110 is disposed closest to the object side. The object side surface R11 of the first object-side lens 110 can be convex upward. That is, the object side surface R11 of the first object-side lens 110 can be convex toward the object side. The upper surface R15 of the first object-side lens 110 can be convex on the object side.

The first intermediate lens 210 is interposed between the first object-side lens 110 and the first image-side lens 310. The first intermediate lens 210 is disposed below the first object-side lens 110. The object side surface R21 of the first intermediate lens 210 is convex downward and the upper surface R25 of the first intermediate lens 210 is convex downward.

The first image-side lens 310 is disposed below the first intermediate lens 210. The first image-side lens 310 is disposed closer to the first light-receiving portion 510 than the first intermediate lens 210. The object side surface R31 and the upper side surface R35 of the first image side lens 310 may be aspherical. More specifically, the object side surface R31 and the upper side surface R35 of the first image side lens 310 may be aspherical surfaces including an inflection point.

A first diffraction grating 11 is formed on at least one surface of the first object-side lens 110, the first intermediate lens 210, and the first image-side lens 310.

More specifically, referring to FIG. 3, the first diffraction grating 11 may be formed on the object side surface R11 of the first object-side lens 110. FIG.

The first diffraction grating 11 may be formed integrally with the first object-side lens 110. The first diffraction grating 11 includes a plurality of first diffraction units 111. The first diffractive units 111 surround the periphery of the optical axis OA1 of the first object-side lens 110. [ The first diffractive units 111 may be arranged concentrically with respect to the optical axis OA1 of the first object-side lens 110. [ In addition, the first diffractive units 111 may be sequentially arranged in the outer direction around the optical axis OA1 of the first object-side lens 110. [

The pitch P1 of the first diffractive units 111 may be about 1 탆 to about 1 mm. In addition, the first diffractive units 111 may include a first diffractive surface 112 and a first diffractive surface 113, respectively.

The first diffractive surface 112 may extend from R11. The first diffractive surface 112 may extend in a direction intersecting the optical axis OA1 of the first object-side lens 110. [ The first diffractive surface 112 may be a curved surface.

The first step surface 113 is bent and extended from the first diffractive surface 112. The first step surface 113 may be bent from the first diffractive surface 112 and extend toward the object side surface R11 of the first object-side lens 110. [ The first step surface 113 may extend in a direction parallel to the optical axis OA1 of the first object-side lens 110. [ The first diffractive surface 112 and the first tread surface 113 may be alternately arranged.

The pitch P1 of the first diffraction grating 11, that is, the width of each first diffractive portion may be 1/7 to 1/10 of the radius of the first object-side lens 110. [ The height h1 of the first diffraction grating 11 is the height of each first diffraction portion 111. [ Here, the height h1 of each first diffractive portion 111 means the width of each of the first step surfaces 113. That is, the height h1 of the first diffractive portion 111 may mean the height of the first object-side lens 110 from the object side surface R11.

More specifically, the height h1 of the first diffraction grating 11 can satisfy the following equation (1).

Equation 1

h1 =? 1 / (n1-1)

Here, h1 is the height of the first diffraction grating 11, lambda 1 is 400 nm to 480 nm, and n1 is the refractive index of the first diffraction grating 11.

For example, the height h1 of the first diffraction grating 11 may be about 660 nm to about 960 nm.

Thus, the first diffraction grating 11 can be designed to be optimized to correct chromatic aberration of blue light. That is, since the first diffraction grating 11 satisfies Equation (1), the chromatic aberration of the light of the wavelength band of about 400 nm to about 480 nm can be corrected effectively.

The first filter unit 410 is disposed under the first image-side lens 310. The first filter unit 410 filters incident light. For example, the first filter 410 may filter light other than blue light. The first filter unit 410 may filter light other than a wavelength range of about 400 nm to about 480 nm.

The first light receiving portion 510 is disposed below the first filter portion 410. The first light receiving unit 510 senses light incident through the first filter unit 410. An image is formed on the first light receiving portion 510. The first light receiving unit 510 may be an image sensor that converts an optical signal corresponding to an object image into an electrical signal, and the image sensor may be a CCD or a CMOS sensor.

The second imaging units 20 take images of the second wavelength band. For example, the second image pickup units 20 can take a green image. The second image sensing units 20 can sense light of about 510 nm to about 560 nm.

2, the second image sensing unit 20 includes a second object-side lens 120, a second intermediate lens 220 and a second image-side lens 320, a second filter unit 420, 2 light receiving portion 520. [

The second object-side lens 120 is disposed closest to the object side. The object side surface R12 of the second object-side lens 120 can be convex upward. That is, the object side surface R12 of the second object-side lens 120 can be convex toward the object side. The upper surface R16 of the second object-side lens 120 can be convex toward the object side.

The second intermediate lens 220 is interposed between the second object-side lens 120 and the second image-side lens 320. The second intermediate lens 220 is disposed below the second object-side lens 120. The object side surface R22 of the second intermediate lens 220 is convex downward and the upper surface R26 of the second intermediate lens 220 is convex downward.

The second image-side lens 320 is disposed below the second intermediate lens 220. The second image-side lens 320 is disposed closer to the second light-receiving unit 520 than the second intermediate lens 220. The object side surface R32 and the upper side surface R36 of the second image side lens 320 may be aspherical. More specifically, the object side surface R32 and the upper side surface R36 of the second image side lens 320 may be aspherical surfaces including an inflection point.

A second diffraction grating 21 is formed on at least one surface of the second object-side lens 120, the second intermediate lens 220, and the second image-side lens 320.

More specifically, referring to FIG. 4, the second diffraction grating 21 may be formed on the object side surface R12 of the second object-side lens 120. FIG.

The second diffraction grating 21 may be formed integrally with the second object-side lens 120. The second diffraction grating 21 includes a plurality of second diffraction units 121. The second diffractive units 121 surround the periphery of the optical axis OA2 of the second object-side lens 120. [ The second diffractive units 121 may be arranged concentrically with respect to the optical axis OA2 of the second object-side lens 120. [ In addition, the second diffraction units 121 may be sequentially arranged in the outward direction around the optical axis OA2 of the second object-side lens 120. [

The pitch of the second diffractive portions 121 may be about 1 탆 to about 1 mm. In addition, the second diffractive units 121 may include a second diffractive surface 122 and a second diffractive surface 123, respectively.

The second diffractive surface 122 may extend from the object side surface R12 of the second object-side lens 120. [ The second diffractive surface 122 may extend in a direction intersecting the optical axis OA2 (OA) of the second object-side lens 120. [ The second diffractive surface 122 may be curved.

The second stepped surface 123 is bent and extended from the second diffractive surface 122. The second stepped surface 123 may be bent from the second diffractive surface 122 and extend toward the object side surface R12 of the second object side lens 120. [ The second step surface 123 may extend in a direction parallel to the optical axis OA2 of the second object-side lens 120. [ The second diffractive surface 122 and the second step surface 123 may be alternately arranged.

The pitch P2 of the second diffraction grating 21, that is, the width of each second diffraction portion 121 may be 1/7 to 1/10 of the radius of the second object-side lens 120 . The height h2 of the second diffraction grating 21 is the height h2 of each second diffraction portion 121. [ Here, the height h2 of each second diffractive portion 121 means the width of each second stepped surface 123. [ That is, the height h2 of the second diffractive portion 121 may mean the height of the second object-side lens 120 from the object side surface R12.

The height h2 of the second diffraction grating 21 is different from the height h1 of the first diffraction grating 11. More specifically, the height h2 of the second diffraction grating 21 may be greater than the height h1 of the first diffraction grating 11.

More specifically, the height h2 of the second diffraction grating 21 can satisfy the following equation (2).

Equation 2

h2 =? 2 / (n2-1)

Here, h2 is the height of the second diffraction grating 21,? 2 is 510 nm to 560 nm, and n2 is the refractive index of the second diffraction grating 21.

For example, the height h2 of the second diffraction grating 21 may be about 850 nm to about 1120 nm.

In this way, the second diffraction grating 21 can be designed to be optimized so as to correct the chromatic aberration of the green light. That is, since the second diffraction grating 21 satisfies the expression (2), the chromatic aberration of the light of the wavelength band of about 510 nm to about 560 nm can be corrected effectively.

The second filter unit 420 is disposed below the second upper-side lens 320. The second filter unit 420 filters incident light. For example, the second filter unit 420 may filter light other than green light. The second filter unit 420 may filter light other than a wavelength range of about 510 nm to about 560 nm.

The second light receiving portion 520 is disposed below the second filter portion 420. The second light receiving unit 520 senses light incident through the second filter unit 420. And an image is formed on the second light receiving portion 520. The second light receiving unit 520 may be an image sensor that converts an optical signal corresponding to an object image into an electrical signal, and the image sensor may be a CCD or a CMOS sensor.

The third image pickup units 30 take images of the third wavelength band. For example, the third image pickup units 30 can take a red image. The third image sensing units 30 can sense light of about 630 nm to about 670 nm.

2, the third image pickup unit 30 includes a third object-side lens 130, a third intermediate lens 230 and a third image-side lens 330, a third filter unit 430, 3 light receiving unit 530. [

The third object-side lens 130 is disposed closest to the object side. The object side surface R13 of the third object-side lens 130 can be convex upward. That is, the object side surface R13 of the third object-side lens 130 can be convex toward the object side. The upper surface R17 of the third object-side lens 130 can be convex on the object side.

The third intermediate lens 230 is interposed between the third object-side lens 130 and the third image-side lens 330. The third intermediate lens 230 is disposed below the third object-side lens 130. The object side surface R23 of the third intermediate lens 230 is convex downward and the upper surface R27 of the third intermediate lens 230 is convex downward.

The third image-side lens 330 is disposed below the third intermediate lens 230. The third image-side lens 330 is disposed closer to the third light-receiving portion 530 than the third intermediate lens 230. The object side surface R33 and the upper side surface R37 of the third image side lens 330 may be aspherical. More specifically, the object side surface R33 and the upper side surface R37 of the third image side lens 330 may be aspherical surfaces including inflection points.

A third diffraction grating 31 is formed on at least one surface of the third object-side lens 130, the third intermediate lens 230, and the third image-side lens 330.

More specifically, referring to FIG. 5, the third diffraction grating 31 may be formed on the object side surface R13 of the third object-side lens 130. FIG.

The third diffraction grating 31 may be integrally formed with the third object-side lens 130. The third diffraction grating 31 includes a plurality of third diffraction portions 31. The third diffractive zones 31 surround the periphery of the optical axis OA3 of the third object-side lens 130. [ The third diffraction units 31 may be arranged concentrically with respect to the optical axis OA3 of the third object-side lens 130. [ In addition, the third diffractive zones 31 may be sequentially arranged in the outward direction around the optical axis OA3 of the third object-side lens 130. [

The pitch of the third diffractive portions 31 may be about 1 탆 to about 1 mm. The third diffractive zones 31 may include a third diffractive surface 132 and a third diffractive surface 133, respectively.

The third diffractive surface 132 may extend from the object side surface R13 of the third object-side lens 130. [ The third diffractive surface 132 may extend in a direction crossing the optical axis OA3 of the third object-side lens 130. [ The third diffractive surface 132 may be a curved surface.

And the third stepped surface 133 is bent and extended from the third diffractive surface 132. The third stepped surface 133 may be bent from the third diffractive surface 132 and extend toward the object side surface R13 of the third object side lens 130. [ The third stage surface 133 may extend in a direction parallel to the optical axis OA3 of the third object-side lens 130. [ The third diffractive surface 132 and the third stage surface 133 may be alternately arranged.

The pitch P3 of the third diffraction grating 31, that is, the width of each third diffractive portion 131 may be 1/7 to 1/10 of the radius of the third object-side lens 130 . The height h3 of the third diffraction grating 31 is the height of each third diffraction portion. Here, the height h3 of each third diffractive portion 131 means the width of each third stepped surface 133. [ That is, the height h3 of the third diffractive portion 131 may mean the height of the third object-side lens 130 from the object side surface R13.

The height h3 of the third diffraction grating 31 is different from the height h2 of the second diffraction grating 21. More specifically, the height h3 of the third diffraction grating 31 may be greater than the height h2 of the second diffraction grating 21.

More specifically, the height h3 of the third diffraction grating 31 can satisfy the following equation (3).

Equation 3

h3 =? 3 / (n3-1)

Here, h3 is the height of the third diffraction grating 31,? 3 is 630 nm to 670 nm, and n3 is the refractive index of the third diffraction grating 31.

For example, the height h3 of the third diffraction grating 31 may be about 1150 nm to about 1340 nm.

Thus, the third diffraction grating 31 can be designed to be optimized to correct the chromatic aberration of the red light. That is, since the third diffraction grating 31 satisfies the expression (2), the chromatic aberration of the light of the wavelength band of about 630 nm to about 670 nm can be corrected effectively.

The third filter unit 430 is disposed below the third image-side lens 330. The third filter unit 430 filters the incident light. For example, the third filter unit 430 may filter light other than red light. The third filter unit 430 may filter light other than a wavelength range of about 630 nm to about 670 nm.

The third light receiving portion 530 is disposed below the third filter portion 430. [ The third light receiving unit 530 senses light incident through the third filter unit 430. And an image is formed on the third light receiving portion 530. The third light receiving unit 530 may be an image sensor that converts an optical signal corresponding to a subject image into an electrical signal, and the image sensor may be a CCD or a CMOS sensor.

The fourth imaging units (40) take images of the fourth wavelength band. For example, the fourth image sensing units 40 may capture an infrared image. The fourth image sensing units 40 can sense light of about 700 nm to about 1000 nm.

2, the fourth imaging unit 40 includes a fourth object-side lens 140, a fourth intermediate lens 240 and a fourth image-side lens 340, a fourth filter unit 440, 4 light receiving unit 540. [

The fourth object-side lens 140 is disposed closest to the object side. The object side surface R14 of the fourth object-side lens 140 can be convex upward. That is, the object side surface R14 of the fourth object-side lens 140 can be convex toward the object side. The upper surface R18 of the fourth object-side lens 140 can be convex on the object side.

The fourth intermediate lens 240 is interposed between the fourth object-side lens 140 and the fourth image-side lens 340. The fourth intermediate lens 240 is disposed below the fourth object-side lens 140. The object side surface R24 of the fourth intermediate lens 240 is convex downward and the upper surface R28 of the fourth intermediate lens 240 is convex downward.

The fourth image-side lens 340 is disposed below the fourth intermediate lens 240. The fourth image-side lens 340 is disposed closer to the fourth light-receiving unit 540 than the fourth intermediate lens 240. The object side surface R34 and the upper side surface R38 of the fourth image side lens 340 may be aspherical. More specifically, the object side surface R34 and the upper side surface R38 of the fourth image side lens 340 may be aspherical surfaces including an inflection point.

A fourth diffraction grating 41 is formed on at least one surface of the fourth object-side lens 140, the fourth intermediate lens 240, and the fourth image-side lens 340.

More specifically, referring to FIG. 6, the fourth diffraction grating 41 may be formed on the object side surface R14 of the fourth object-side lens 140. [

The fourth diffraction grating 41 may be integrally formed with the fourth object-side lens 140. The fourth diffraction grating 41 includes a plurality of fourth diffraction portions 41. The fourth diffractive zones (41) surround the periphery of the optical axis (OA4) of the fourth object-side lens (140). The fourth diffractive zones 41 may be arranged concentrically with respect to the optical axis OA4 of the fourth object-side lens 140. [ In addition, the fourth diffractive zones 41 may be sequentially arranged in the outward direction around the optical axis OA4 of the fourth object-side lens 140. [

The pitch of the fourth diffraction portions 41 may be about 1 [mu] m to about 1 mm. The fourth diffractive zones 41 may include a fourth diffractive surface 142 and a fourth diffractive surface 143, respectively.

The fourth diffractive surface 142 may extend from the object side surface R14 of the fourth object-side lens 140. [ The fourth diffractive surface 142 may extend in a direction intersecting the optical axis OA4 (OA) of the fourth object-side lens 140. [ The fourth diffractive surface 142 may be a curved surface.

The fourth step difference surface 143 is bent and extended from the fourth diffraction surface 142. The fourth step difference surface 143 may be bent from the fourth diffractive surface 142 and extend toward the object side surface R14 of the fourth object side lens 140. [ The fourth stage surface 143 may extend in a direction parallel to the optical axis OA4 of the fourth object-side lens 140. [ The fourth diffractive surface 142 and the fourth stage surface 143 may be alternately arranged.

The pitch of the fourth diffraction grating 41, that is, the width of each fourth diffractive portion may be 1/7 to 1/10 of the radius of the fourth object-side lens 140. The height h4 of the fourth diffraction grating 41 is the height of each fourth diffraction portion 141. [ Here, the height h4 of each fourth diffractive portion 141 means the width of each fourth step difference surface 143. That is, the height h4 of the fourth diffractive portion 141 may mean the height of the fourth object-side lens 140 from the object side surface R14.

The height (h4) of the fourth diffraction grating (41) is different from the height (h3) of the third diffraction grating (31). More specifically, the height h4 of the fourth diffraction grating 41 may be greater than the height h3 of the third diffraction grating 31. [

More specifically, the height h4 of the fourth diffraction grating 41 can satisfy the following expression (4).

Equation 4

h4 =? 4 / (n4-1)

Here, h4 is the height of the fourth diffraction grating 41,? 4 is 700 nm to 1000 nm, and n4 is the refractive index of the fourth diffraction grating 41.

For example, the height h4 of the fourth diffraction grating 41 may be about 1160 nm to about 2000 nm.

In this way, the fourth diffraction grating 41 can be designed to be optimized so as to correct the chromatic aberration of infrared rays. That is, since the fourth diffraction grating 41 satisfies the expression (2), the chromatic aberration of the light of the wavelength band of about 700 nm to about 1000 nm can be corrected effectively.

The fourth filter unit 440 is disposed below the fourth image-side lens 340. The fourth filter unit 440 filters the incident light. For example, the fourth filter unit 440 may filter light other than infrared rays. The fourth filter unit 440 may filter light other than a wavelength range of about 700 nm to about 1000 nm.

The fourth light receiving portion 540 is disposed below the fourth filter portion 440. The fourth light receiving unit 540 senses light incident through the fourth filter unit 440. An image is formed on the fourth light receiving portion 540. The fourth light receiving unit 540 may be an image sensor that converts an optical signal corresponding to an object image into an electrical signal, and the image sensor may be a CCD or a CMOS sensor.

2, the first object-side lens 110, the second object-side lens 120, the third object-side lens 130, and the fourth object-side lens 140 are arranged in a first The lens array substrate 100 can be constructed.

The first intermediate lens 210, the second intermediate lens 220, the third intermediate lens 230 and the fourth intermediate lens 240 may constitute the second lens array substrate 200 have. The first image side lens 310, the second image side lens 320, the third image side lens and the fourth image side lens 340 may constitute a third lens array substrate 300 have.

Also, first spacers 51 may be interposed between the second lens array substrate 200 and the third lens array substrate 300. Also, second spacers 52 may be interposed between the third lens array substrate 300 and the filter units 410, 420, 430, and 440. Third spacers 53 may be interposed between the filter units 410, 420, 430, 440 and the light receiving units 510, 520, 530, 540.

As described above, the first diffraction grating 11, the second diffraction grating 21, the third diffraction grating 31, and the fourth diffraction grating 41 are formed by the first imaging unit 10, The second imaging unit 20, the third imaging unit 30, and the fourth imaging unit 40, as shown in FIG.

Accordingly, the first imaging section 10, the second imaging section 20, the third imaging section 30, and the fourth imaging section 40 correct chromatic aberration of light of a specific wavelength band. That is, the imaging apparatus according to the present embodiment can optimize the design of the diffraction gratings for each image of the wavelength band to be photographed, thereby effectively correcting the chromatic aberration.

Therefore, the image pickup apparatus according to the embodiment can take enhanced images for each wavelength band. In addition, the image pickup apparatus according to the embodiment may integrate images photographed for each wavelength band, and may be implemented as one image.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (11)

A first image sensing unit for sensing a blue image;
A second image sensing unit for sensing a green image;
A third image sensing unit for sensing a red image;
And a fourth image sensing unit for sensing an infrared image,
Each of the first to fourth image pickup units
A first lens having an object side surface and an image side surface formed to be convex upward;
A second lens disposed below the first lens and having an object-side surface and an upper surface formed to be convex downward;
And a third lens which is disposed below the second lens and is formed as an aspherical surface including an object side surface and an inflection point on the object side in the second lens direction,
A plurality of spacers corresponding to the first to fourth image sensing units are provided between the second lens and the third lens,
Wherein the first lens of the first imaging unit includes a diffraction grating having a height of 660 nm to 960 nm on one side
Wherein the first lens of the second imaging unit includes a diffraction grating having a height of 850 nm to 1120 nm on one side
Wherein the first lens of the third image pickup unit includes a diffraction grating having a height of 1150 nm to 1340 nm on one surface thereof
Wherein the first lens of the fourth imaging unit includes a diffraction grating having a height of 1160 nm to 2000 nm on one surface thereof,
The diffraction grating is formed on the object side surface of the first lens,
And the width of the diffraction grating is formed to be 1/7 to 1/10 of the radius of the first lens of each of the first to fourth imaging units The method according to claim 1,
Wherein the diffraction grating of the first image sensing unit corrects chromatic aberration of the wavelength band light of 400 nm to 480 nm,
Wherein the diffraction grating of the second image sensing unit corrects chromatic aberration of the light of the wavelength range of 510 nm to 560 nm,
Wherein the diffraction grating of the third image sensing unit corrects chromatic aberration of light of 630 nm to 670 nm wavelength band,
And the diffraction grating of the fourth image sensing unit corrects chromatic aberration of the 700-1000 nm wavelength band light. The method according to claim 1,
The diffraction grating is formed integrally with the first lens,
And a plurality of diffractive portions arranged so as to surround the optical axis in a concentric circular structure,
Each of the plurality of diffractive portions
A diffractive surface of a curved surface;
And a stepped surface extending from one side of the diffractive surface so as to bend,
And the width of the diffractive portions is formed to be 1 占 퐉 to 1 mm. delete The method according to claim 1,
The first to fourth imaging units
A filter unit disposed below the third lens, for filtering light other than the color captured by each of the image pickup units;
And a light receiving unit disposed under the filter unit and sensing light incident on each of the image pickup units. The method according to claim 1,
Wherein the first to fourth imaging units are arranged in a matrix form. The method according to claim 6,
Wherein a plurality of combinations of the first to fourth imaging units arranged in the matrix form are formed. delete delete delete delete

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