TWI564609B - Optical imaging lens system and imaging capturing unit - Google Patents

Description

Optical imaging lens and image capturing device

The present invention discloses an optical imaging lens and an image capturing device, and more particularly to an optical imaging lens including an arbitrarily detachable infrared filter and a light blocking member, and an image capturing device to which the optical imaging lens is applied.

In general, the photosensitive elements of the photographing device are mostly a photosensitive coupled device (CCD) or a complementary metal-Oxide semiconductor sensor (CMOS Sensor). The photographic device is very sensitive to infrared light. For example, when shooting with a photographic device during the daytime, since the sunlight contains more infrared light, it is necessary to filter out the infrared light to improve image sharpness. When shooting at night, due to insufficient light intensity, it is necessary to collect light in the infrared band to maintain image quality.

Conventional photographic devices are often provided with an infrared filter that is located between the optical lens of the photographic device and the imaging surface. In order to meet the needs of the photographic device for simultaneous use in daytime and nighttime environments, some operators additionally install switching devices between the photographic device and the imaging surface to switch the position of the infrared filter. However, since it is necessary to reserve extra space between the optical lens and the imaging surface of the photographing device for mounting the switching device, It is not conducive to shortening the back focal length of the optical lens of the photographing device, so that the size of the photographing device is easily oversized, and the design difficulty of the photographing device is also increased, thereby increasing the manufacturing cost.

In addition, the aperture specifications of conventional photographic devices are difficult to meet both daytime And the needs of the night environment. For example, when the photographing device is equipped with an aperture suitable for use in a daytime environment, when the photographing device is used at night, there is a problem that the image clarity is insufficient due to insufficient light entering the light. On the other hand, when the photographing apparatus mounts an aperture suitable for use in a nighttime environment, the photographing apparatus may cause excessive noise due to excessive stray light collected during daylight use.

In view of the above problems, the present invention provides an optical imaging lens and an image capturing device, which contributes to solving the problem that the photographic lens needs to be additionally equipped with a switching device, and that the aperture size is difficult to meet the needs of daytime and nighttime use.

The optical imaging lens disclosed in the present invention includes a lens group, an infrared filter, an aperture, and a light blocking member. The lens group has opposite image sides and object sides. The infrared filter is detachably disposed on the object side of the lens group. The aperture is disposed on the object side of the lens group, and the aperture has a hole-like grating. The light shielding member is detachably disposed on the object side of the lens group, and the light shielding member has a through hole. When the light blocking member is disposed on the object side of the lens group, the perforated and apertured gratings are all located on an optical axis.

The image capturing device disclosed in the present invention comprises the aforementioned optical imaging lens and an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the optical imaging lens.

An optical imaging lens and an image capturing device according to the present invention, The infrared filter and the light blocking member are detachably disposed on the object side of the lens group to be exposed. When the infrared filter is to be installed or removed, the user can directly install or remove the infrared filter and the light shielding member. Thereby, the image capturing device does not need to additionally add a switching device between the lens group and the electronic photosensitive element, and the back focus of the optical imaging lens can be effectively shortened to maintain the miniaturization thereof, and the manufacturing cost is reduced. In addition, the perforation of the light-shielding member and the aperture-shaped aperture grating of the aperture help to properly configure the aperture value of the optical imaging lens, and the optical imaging lens can maintain an appropriate amount of light in different environments, thereby further improving the imaging quality.

The above description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the principles of the invention.

E‧‧‧ surveillance camera

M‧‧‧ image capture device

L‧‧‧ optical axis

1‧‧‧ optical imaging lens

2‧‧‧Electronic photosensitive element

10‧‧‧ lens group

100a‧‧‧ object side

100b‧‧‧ image side

110‧‧‧first lens

111‧‧‧Side side surface

112‧‧‧ image side surface

120‧‧‧second lens

121‧‧‧Side side surface

122‧‧‧ image side surface

130‧‧‧ third lens

131‧‧‧ object side surface

132‧‧‧Image side surface

140‧‧‧Fourth lens

141‧‧‧ object side surface

142‧‧‧ image side surface

150‧‧‧ fifth lens

151‧‧‧ object side surface

152‧‧‧ image side surface

160‧‧‧Lighting components

20‧‧‧Infrared filter

30‧‧‧ aperture

310‧‧‧ hole grating

40‧‧‧Lighting parts

410‧‧‧Perforation

50‧‧‧ imaging surface

Fig. 1 is a side elevational view showing the image capturing apparatus used in the daytime according to an embodiment of the present invention.

Fig. 2 is a side elevational view showing the image capturing apparatus used at night according to an embodiment of the present invention.

Fig. 3 is a perspective view showing the use of an electronic device equipped with an image taking device at night according to an embodiment of the present invention.

Fig. 4 is a perspective view showing the use of an electronic device equipped with an image taking device for daylight use according to an embodiment of the present invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to both Figure 1 and Figure 2. Fig. 1 is a side elevational view showing the image capturing apparatus used in the daytime according to an embodiment of the present invention. Fig. 2 is a side elevational view showing the image capturing apparatus used at night according to an embodiment of the present invention.

In the present embodiment, an image taking device M includes an optical imaging lens 1 and an electronic photosensitive element 2. The optical imaging lens 1 includes a lens group 10, an infrared filter 20, an aperture 30, and a light blocking member 40. The electronic photosensitive element 2 is disposed on an image plane 50 of the optical imaging lens 1. The image forming surface 50 is, for example, a film, a screen, or a surface of a light receiver attached to the electronic photosensitive element 2. The image taking device M may further comprise a barrel (Barrel Member), a support device (Holder Member) or a combination thereof.

The lens group 10 has an object side 100a and an image side 100b, and the optical imaging lens 10 sequentially includes a first lens 110, a second lens 120, and a first portion having a refractive power from the object side 100a to the image side 100b. A three lens 130, a fourth lens 140 and a fifth lens 150. The object side 100a means that when the optical imaging lens 1 is used to capture a subject (not shown), the lens group 10 faces the side of the subject. The image side 100b means that when the optical imaging lens 1 is used for photographing a subject, the lens group 10 is oriented toward imaging. One side of the face 50.

The first lens 110 has a positive refractive power and is made of glass. The first lens 110 has an object side surface 111 facing the object side 100a and an image side surface 112 facing the image side 100b. The object side surface 111 is convex at the near optical axis L, and the image side surface 112 is planar at the near optical axis L. The object side surface 111 is a spherical surface (SPH).

The second lens 120 has a positive refractive power and is made of glass. The second lens 120 has an object side surface 121 facing the object side 100a and an image side surface 122 facing the image side 100b. The object side surface 121 is convex at the near optical axis L, and the image side surface 122 is concave at the near optical axis L. Both the object side surface 121 and the image side surface 122 are spherical.

The third lens 130 has a negative refractive power and is made of glass. The third lens 130 has an object side surface 131 facing the object side 100a and an image side surface 132 facing the image side 100b. The object side surface 131 is planar at the near optical axis L, and the image side surface 132 is concave at the near optical axis L. The image side surface 132 is a spherical surface.

The fourth lens 140 has a positive refractive power and is made of glass. The fourth lens 140 has an object side surface 141 facing the object side 100a and an image side surface 142 facing the image side 100b. The object side surface 141 is convex at the near optical axis L, and the image side surface 142 is convex at the near optical axis L. Both the object side surface 141 and the image side surface 142 are spherical.

The fifth lens 150 has a negative refractive power and is made of glass. The fifth lens 150 has an object side surface 151 facing the object side 100a and an image side 100b facing One image side surface 152. The object side surface 151 is concave at the near optical axis L, and the image side surface 152 is convex at the near optical axis L. Both the object side surface 151 and the image side surface 152 are spherical.

In addition, in the embodiment, the lens group 10 further includes a light transmissive element 160. The light transmitting element 160 is, for example, a glass protective sheet, and is provided on the image side 100b of the lens group 10. In the present embodiment, the light transmissive element 160 is disposed between the fifth lens 150 and the imaging surface 50. The light transmitting member 160 does not have a refractive power, that is, the light transmitting member 160 does not affect the image quality of the optical imaging lens 1.

The infrared filter 20 is detachably provided on the object side 100a of the lens group 10. In other words, when the optical imaging lens 1 is used to photograph a subject, the infrared filter 20 is interposed between the subject and the lens group 10.

The aperture 30 is disposed on the object side 100a of the lens group 10, and the positions of both the aperture 30 and the infrared filter 20 may or may not overlap each other. Further, in the present embodiment, when the infrared filter 20 and the aperture 30 are both disposed on the object side 100a, the aperture 30 is interposed between the infrared filter 20 and the lens group 10. In other embodiments, the infrared filter 20 is interposed between the aperture 30 and the lens assembly 10. Thereby, the aperture 30 is a front aperture, which causes the exit pupil of the optical imaging lens 1 to generate a long distance from the imaging surface 50 to enhance the telecentric effect and increase the image of the electronic photosensitive element 2. Receiving efficiency. The aperture 30 has a hole-like grating 310 for controlling the amount of light incident from the object side 100a to the image side 100b.

The light blocking member 40 is, for example, a plastic cover that has been subjected to blackening treatment, and has A through hole 410 is formed on the opposite side of the light blocking member 40, and the aperture of the through hole 410 is smaller than the aperture of the apertured grating 310 of the aperture 30. The light blocking member 40 is detachably disposed on the object side 100a of the lens group 10. When the light blocking member 40 is disposed on the object side 100a, the perforations 410 and the aperture gratings 310 of the aperture 30 are located on the optical axis L. Further, in the present embodiment, the infrared filter 20 is assembled to the light blocking member 40, and the infrared filter 20 and the light blocking member 40 can be disposed together on the object side 100a of the lens group 10, and can be collectively The object side 100a is detached, the details of which will be further described later.

In the present embodiment, the optical imaging lens 1 is suitable for use in an environment where light is sufficient (for example, daylight) and an environment where light is insufficient (for example, at night). As shown in FIG. 1, when the optical imaging lens 1 is used during the day, the infrared filter 20 is placed on the object side 100a of the lens group 10. At this time, the perforation 410 of the light blocking member 40 and the aperture grating 310 of the aperture 30 are all located on the optical axis I, so that the light reaches the image side 100b from the object side 100a via the through hole 410 and the aperture grating 310. Thereby, the light blocking member 40 and the aperture 30 help to properly configure the aperture value (f-number, Fno) of the optical imaging lens 1 so that the optical imaging lens 1 can collect sufficient visible light during the day to achieve the purpose of clear imaging (meaning That is, at this time, the through hole 410 and the hole-shaped grating 310 collectively control the amount of light incident from the object side 100a to the image side 100b. Preferably, when the optical imaging lens 1 is used during the day, the light blocking member 40 and the aperture 30 collectively configure the aperture value of the optical imaging lens 1 to be 5.0.

As shown in FIG. 2, when the optical imaging lens 1 is used at night, the infrared filter 20 and the light blocking member 40 are directly detached from the object side 100a of the lens group 10. At this time, since the optical imaging lens 1 has no infrared filtering at the optical axis L In the case of 20, the light in the infrared band (750 nm to 1050 nm) passes through the aperture 30 and the lens group 10 to the image side 100b of the lens group 10. In addition, when the optical imaging lens 1 is used at night, since the light shielding member 40 is removed from the optical axis L, the light is not blocked by the light shielding member 40 from the object side 100a to the image side 100b, thereby facilitating the configuration. The aperture value of the optical imaging lens 1 is such that the optical imaging lens 1 can collect sufficient infrared light at night to achieve the purpose of clear imaging (that is, the amount of light incident on the image side 100b at this time is not affected by the perforation 410, and It is only affected by the aperture grating 310). Preferably, the optical imaging lens 1 has an aperture value of 1.2 when the optical imaging lens 1 is used at night.

Further, a distance from the image side surface 152 of the fifth lens 150 to the imaging surface 50 on the optical axis is BFL. The fifth lens 150 is movable along the optical axis to adjust the distance BFL. As shown in Fig. 1, when the optical imaging lens 1 is used during the day (i.e., when the infrared filter 20 is disposed on the object side 100a of the lens group 10), the distance BFL has a first value. When the optical imaging lens 1 is used at night (i.e., when the infrared filter 20 is detached from the lens group 10), the distance BFL has a second value. The second value is greater than the first value. Preferably, the first value is 4.00 mm (mm) and the second value is 4.12 mm. Thereby, it is helpful to appropriately configure the distance BFL of the image side surface 152 to the imaging surface 50 on the optical axis to correct the aberration of the optical imaging lens 1.

Refer to Table 1 and Table 2 below. Table 1 is an optical parameter of each component used in the daylighting device in the present embodiment. Table 2 is an optical parameter of each component used in the image capturing apparatus in the present embodiment at night.

In this embodiment, any two adjacent lenses of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 have an air gap between the near optical axes L, and That is, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 may be five single non-joined (non-bonded) and refractive lenses. Since the process of bonding the lens is more complicated than that of the non-joining lens, especially the joint surface of the two lenses needs to have a high-precision curved surface in order to achieve high adhesion when the two lenses are joined, and is more likely to be caused by the deviation during the bonding process. Axial displacement defects affect the overall optical imaging quality. Therefore, each lens is designed as a single non-joining refractive power, thereby effectively improving the problems caused by the cemented lens.

In this embodiment, if the refractive power or focal length of the lens does not define the position of the region, it indicates that the refractive power or focal length of the lens is the refractive power or focal length of the lens at the near optical axis.

In this embodiment, the imaging surface 50 may have a plane or a curved surface according to the shape of the corresponding electronic photosensitive element 2, and in particular, a curved surface whose concave surface faces the object side.

In this embodiment, the lens group 10 may be further provided with at least one aperture, which may be disposed before the first lens 110 of the lens group 10, between two adjacent lenses or after the fifth lens 150. The type of 阑 is, for example, Glare Stop or Field Stop, which is used to reduce stray light and contribute to image quality.

Referring to FIG. 3 and FIG. 4, FIG. 3 is a perspective view showing an electronic device equipped with an image taking device used at night according to an embodiment of the present invention. Fig. 4 is a perspective view showing the use of an electronic device equipped with an image taking device for daylight use according to an embodiment of the present invention.

In the present embodiment, the image capturing device M can be mounted on an electronic device such as a monitoring camera E. Preferably, the electronic device may further comprise Control Units, Display Units, Storage Units, Temporary Storage Units (RAM), or a combination thereof.

As shown in FIG. 2 and FIG. 3, when the monitor camera E is used at night, the user can open the light blocking member 40 pivotally disposed on the outer casing of the monitoring camera E, and the light blocking member 40 and the light shielding member 40 are assembled. The infrared filter 20 is removed from the object side 100a of the lens group 10 at the same time.

As shown in FIGS. 1 and 4, when the monitor camera E is used during the day, the user can rotate the shade 40 to cover it, and the shade member 40 and the infrared filter 20 are disposed together. Side 100a. At this time, the perforation 410 and the aperture grating 310 of the aperture 30 are both located on the optical axis L, and the infrared filter 20 is interposed between the perforation 410 of the shading 40 and the aperture grating 310 of the aperture 30.

In the present embodiment, the imaging optical lens 1 is more suitable for use in an optical system for moving focus, and has both excellent aberration correction and good imaging quality. The image capturing device M can also be applied to three-dimensional (3D) image capturing, digital cameras, tablet computers, smart televisions, smart phones, network monitoring devices, driving recorders, reversing developing devices, and somatosensory gaming machines. In an electronic device such as a wearable device. The foregoing electronic device is merely illustrative of the practical application of the present invention, and does not limit the scope of application of the image taking device of the present invention.

In summary, in the optical imaging lens and the image capturing device disclosed in the present invention, the infrared filter and the light blocking member are detachably disposed on the object side of the lens group to be exposed. When the infrared filter is to be installed or removed, the user can directly install or remove the infrared filter and the light shielding member. Thereby, the image capturing device does not need to additionally add a switching device between the lens group and the electronic photosensitive element, and the back focus of the optical imaging lens can be effectively shortened to maintain the miniaturization thereof, and the manufacturing cost is reduced. In addition, the perforation of the light-shielding member and the aperture-shaped aperture grating of the aperture help to properly configure the aperture value of the optical imaging lens, and the optical imaging lens can maintain an appropriate amount of light in different environments, thereby further improving the imaging quality.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

M‧‧‧ image capture device

1‧‧‧ optical imaging lens

2‧‧‧Electronic photosensitive element

10‧‧‧ lens group

100a‧‧‧ object side

100b‧‧‧ image side

110‧‧‧first lens

111‧‧‧Side side surface

112‧‧‧ image side surface

120‧‧‧second lens

121‧‧‧Side side surface

122‧‧‧ image side surface

130‧‧‧ third lens

131‧‧‧ object side surface

132‧‧‧Image side surface

140‧‧‧Fourth lens

141‧‧‧ object side surface

142‧‧‧ image side surface

150‧‧‧ fifth lens

151‧‧‧ object side surface

152‧‧‧ image side surface

160‧‧‧Lighting components

20‧‧‧Infrared filter

30‧‧‧ aperture

310‧‧‧ hole grating

40‧‧‧Lighting parts

410‧‧‧Perforation

50‧‧‧ imaging surface

Claims (9)

An optical imaging lens comprising: a lens group having an opposite image side and an object side; an infrared filter member detachably disposed on the object side of the lens group; and an aperture disposed on the lens group On the object side, the aperture is disposed between the infrared filter and the lens group, a lens having a refractive power between the aperture and the infrared filter, and the aperture has a hole grating; and a light shielding member Removably disposed on the object side of the lens group, the light shielding member has a through hole connecting the opposite sides of the light shielding member, and when the light shielding member is disposed on the object side, the through hole and the hole grating are located On an optical axis. The optical imaging lens of claim 1, wherein the aperture of the aperture is smaller than the aperture of the aperture grating. The optical imaging lens of claim 1, wherein the infrared filter is detachably disposed between the aperture and the lens group. The optical imaging lens of claim 1, wherein the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a refractive power from the object side to the image side. a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all made of glass. The optical imaging lens of claim 4 further comprising a light transmissive element disposed on the image side of the lens group, and the light transmissive element has no refractive power. The optical imaging lens of claim 4, wherein any two of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are Each of the near optical axes has an air gap, and among the air spaces, the air gap between the third lens and the fourth lens is a maximum. The optical imaging lens of claim 4, wherein the first lens has a positive refractive power, the second lens has a positive refractive power, the third lens has a negative refractive power, the fourth lens has a positive refractive power, and the fourth lens has a positive refractive power The fifth lens has a negative refractive power. The optical imaging lens of claim 4, wherein a distance from the side surface of the fifth lens image to an imaging surface on the optical axis is BFL, and the fifth lens is movable along the optical axis to adjust the distance BFL. When the infrared filter is disposed on the lens group, the distance BFL has a first value. When the infrared filter is separated from the lens group, the distance BFL has a second value, and the second value is greater than the first value. A value. An image capturing device comprising: the optical imaging lens of claim 1; and an electronic photosensitive element disposed on an imaging surface of the optical imaging lens.