KR101563281B1 - Ac cob type led - Google Patents

Abstract

The present invention realest to an AC-COB-type LED to which an eight-pin electrode structure is applied. The AC-COB-type LED can be provided as a high-power LED using AC voltage as driving power and can be used with free voltage. Therefore, not only operation stability of the AC-COB-type LED can be obtained but also efficiency of AC-COB-type LED can be increased. A structure of the AC-COB-type LED can be designed and arranged at an optimal ratio resulted from a circular COB arrangement, and serial and parallel connection using multiple LED chips. The AC-COB-type LED uses AC voltage and thus can be operated with free voltage. Therefore, the AC-COB-type LED can be sold in not only the Korean market but also continental markets such as the American market, the Chinese market, and the Russian market. The AC-COB-type LED can expand markets and is useful. Unlike an existing LED, the AC-COB-type LED has high efficiency when operated with high power and has a low failure rate. The AC-COB-type LED has price competitiveness and can have a simple design.

Description

AC COB Type LED {AC COB TYPE LED}

The present invention relates to an AC COB type LED that uses an AC voltage as a driving power without using a converter such as an SMPS. More particularly, the present invention provides a high-power high-output LED that can be used as a free bolt, And to improve the efficiency of the AC COB type LED.

According to recent LED industry trend report, it is expected that price and design will be an important factor in market share along with practicality. Technically, AC DOB (AC Driver On Board) type, AC COB (Chip On Board) Type LED module will be highlighted.

The above-mentioned AC COB type and AC DOB type LED modules are expected to lead the global LED market including domestic market as they can maintain AC characteristics such as price competitiveness and life span.

As a result, studies on LED lighting using the AC COB type and AC DOB type LED modules have been actively conducted, various products have been proposed and released, and they have been widely applied to streetlights and security lamps.

The above-mentioned AC COB type and AC DOB type LED modules have been derived as an alternative method for eliminating the disadvantages of the DC LED module using the DC voltage as the driving power and using the converter such as the SMPS and removing the SMPS. AC drivers having a driving circuit for increasing the light emission width and increasing the power factor are used together as they are used without conversion.

However, even when the AC driver is used, there has been a problem in driving control of the AC LED module when the high power is driven at a high power, and there is a limitation in using the AC LED module because it can not be used as a free bolt.

In addition, there has been a problem that driving stability is low when the AC LED module is driven at high power.

When the power is turned on / off to supply / cut off the driving voltage to / from the AC LED module, a potential difference is generated between the LED chips and the induced electromotive force is exceeded, thereby causing a problem such as a short circuit.

In addition, it is difficult to apply to other than this specific voltage, and it is impossible to use it as a pre-bolt and to operate at high power. Therefore, it can not be used in the continental market such as the United States, China and Russia And there are technical limitations in manufacturing the AC LED module.

In addition, there has been a problem that energy efficiency is low when a high power is driven.

On the other hand, in the prior art document, Korean Patent Laid-Open No. 10-2014-0082109 proposes a COB (Chip On Board) type LED, but it can be said that it has a technical difference that can not be compared with the present invention.

Korean Patent Publication No. 10-2014-0082109

It is an object of the present invention to solve the above-mentioned problems and to provide a high-power high-output LED that can be used as a free bolt, thereby ensuring driving stability, And to provide an AC COB type LED which can be improved.

It is an object of the present invention to provide an AC COB type LED capable of driving with a free bolt and capable of creating a high power high output LED for use in the domestic market as well as the continental market such as the United States, China and Russia .

It is an object of the present invention to provide an AC COB type LED which enables energy efficiency to be lowered and a failure rate to be lowered, and a simple design can be created while making cost competitiveness for an AC COB LED possible.

It is an object of the present invention to provide an AC COB type LED which has an optimal ratio according to the arrangement of a plurality of LED chips and serial-parallel connection by applying an 8-pin electrode structure, thereby improving efficiency.

In order to achieve the above object, an AC COB LED according to the present invention includes an AC COB LED having an array of COBs (Chip On Board) in which a plurality of LED chips are connected in series and in parallel, In this case,

A plurality of LED chips are connected in series and in parallel on a top surface of a substrate and are arranged in a circular COB (Chip On Board) so as to form an 8-pin electrode structure on both right and left sides with respect to a vertical center, A plurality of LED chips having a series-parallel connection configuration connected to the first to fourth pins provided on the first pin to the fourth pin are grouped into three groups A1, B1, and C1, (B2) group and a C2 group, and the A1 group, the B2 group, and the C2 group are connected to the eighth pin to the eighth pin, The B1 group, the C1 group and the A2 group, the B2 group, and the C2 group have left and right arrangements with respect to the vertical center of the circle, and have a mirror image arrangement for the series connection group in common, → B1 group → C1 group order And the other half of the circle is arranged in the order of A2 group B2 group C2 group from the outside toward the center.

delete

Here, the ratio of the A1 group: B1 group: C1 group = 2: 3: 4 or 3: 3: 3 for a plurality of LED chips having a circular COB (Chip On Board) , And satisfies the parallel circuit ratio in the ratio of A2 group: B2 group: C2 group = 2: 3: 4; In a plurality of LED chips having a circular chip on board (COB) arrangement connected in parallel with the serial, the serial circuit ratio of the B1 group is larger than that of the A1 group and C1 group, and the A2 group and the C2 And the series circuit ratio of the B2 group is larger than that of the group.

Here, the ratio of the A1 group: B1 group: C1 group = 1: 2: 3 or 2: 2: 2 in a plurality of LED chips having a circular COB (Chip On Board) And a parallel circuit ratio is satisfied in a ratio of the A2 group: B2 group: C2 group = 1: 2: 3; In a plurality of LED chips having a circular chip on board (COB) arrangement connected in parallel with the serial, the serial circuit ratio of the B1 group is larger than that of the A1 group and C1 group, and the A2 group and the C2 And the series circuit ratio of the B2 group is larger than that of the group.

According to the present invention, an 8-pin electrode structure capable of realizing a high-power, high-output LED using an AC voltage as a driving power source and using it as a free bolt, A useful effect of providing the applied AC COB type LED for the free bolt can be achieved.

The present invention can be designed and arranged in an optimal ratio according to a circular COB arrangement using a plurality of LED chips and an eight-pin electrode structure and a series-parallel connection, and it is possible to drive the pre- It can be targeted at the domestic market as well as the continental market such as the United States, China and Russia, and can achieve a useful effect to expand the marketability.

The present invention can improve the efficiency by increasing the energy efficiency while lowering the failure rate by using the AC voltage as the driving power source, different from the conventional one, and improving the cost competitiveness of the AC COB LED to a simple design design It is possible to achieve a useful effect that can be performed.

delete

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating an AC COB LED employing an 8-pin electrode structure according to an embodiment of the present invention; FIG.
FIG. 2 is a view illustrating an electrode wiring pattern for driving an AC COB type LED employing an 8-pin electrode structure according to an embodiment of the present invention. Referring to FIG.
FIG. 3 is an exemplary view showing a COB arrangement of an LED chip in an AC COB type LED employing an 8-pin electrode structure according to an embodiment of the present invention.
FIG. 4 is a view showing another embodiment of the COB arrangement of the LED chip in the AC COB type LED employing the 8-pin electrode structure according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

Hereinafter, an AC COB LED according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

1, an AC COB LED 100 according to an embodiment of the present invention uses an AC voltage as it is as a driving power source. As shown in FIG. 1, a plurality of LED chips 101 are connected in series to a top surface of a substrate 110 And are arranged in parallel with each other and arranged in a circular COB (Chip On Board) so as to form an 8-pin electrode structure on both right and left sides with respect to the vertical center of the substrate 110.

At this time, a plurality of LED chips 101 arranged in a circular COB (Chip On Board) on the upper surface of the substrate 110 are connected to the 8-pin electrode in parallel with the series, Respectively.

The 8-pin electrode is located on one side of the substrate 110 and has four electrode fins of the first to fourth pins 121 to 124. The 8-pin electrode is located on the other side of the substrate 110, And four electrode pins of the eighth pins 125 to 128 are provided.

A plurality of LED chips 101 each having a serial-parallel connection structure are formed in three groups and connected to the first to fourth pins 121 to 124 provided on one side of the substrate 110.

In this case, in order to facilitate the understanding and understanding of the description in the three groups of the plurality of LED chips 101 having the serial-parallel connection configuration, a plurality of LED chips 101 arranged between the first pin 121 and the second pin 122 A plurality of LED chips 101 group arranged between the second pin 122 and the third pin 123 are divided into the group B1 132, the third pin 123, A group of a plurality of LED chips 101 arranged between the fourth pins 124 is defined as a C1 group 133. [

Also, a plurality of LED chips 101, each having a serial-parallel connection structure, are formed in three groups and connected to the fifth to eighth pins 125 to 128 provided on the other side of the substrate 110.

In this case, in order to facilitate the understanding and understanding of the description in the three groups of LED chips 101 having the serial-parallel connection configuration, a plurality of LED chips 101 arranged between the fifth pin 125 and the sixth pin 128 A group of the LED chips 101 arranged between the sixth group 126 and the seventh pin 127 is referred to as a group B2 of the B2 group 132 and the seventh pin 127, And a group of a plurality of LED chips 101 arranged between the eighth pins 128 is defined as a C3 group 133. [

The A1 group 131, the B1 group 132, the C1 group 133, and the A2 group 133 are arranged in a circle on the upper surface of the substrate 110, The group 141, the B2 group 142, and the C2 group 143 are preferably divided into left and right regions with respect to the vertical center of the circle, and the left and right sides are arranged symmetrically with respect to each other.

That is, in the arrangement of the circular COB, the circular half area is connected in series from the outside to the center in the order of A1 group 131, B1 group 132, C1 group 133, And the other half area is arranged in the order of A2 group 141 → B2 group 142 → C2 group 143 in the order from the outside to the center and the A1 group 131, B1 group 132, C1 The other side serial connection group formed by the group A2, the group B2, the group 142 and the group 142 is arranged in a mirror image on the substrate 110.

Here, applying this mirror arrangement structure in groups for a plurality of LED chips 101 can provide driving stability at high power driving for the AC COB type LED 100. Fig.

In addition, when the power is turned on / off in order to supply / cut off the AC driving power, it is possible to prevent a potential difference from occurring between the existing LED chips, thereby lowering or eliminating the potential difference, It is possible to prevent a short circuit from occurring, and it is possible to exhibit the usefulness that the failure rate can be greatly lowered compared with the prior art.

3 and 4, in the group of a plurality of LED chips 101 having a circular chip on board (COB) arrangement on the upper surface of the substrate 110, A parallel circuit ratio is satisfied in a ratio of the A1 group: B1 group: C1 group = 2: 3: 4 or 3: 3: 3 for the parallel connection group formed by the parallel lines formed in parallel, and the A2 group: B2 Group: C2 group = 2: 3: 4 ratio.

The condition satisfying the above-mentioned ratio of A1 group: B1 group: C1 group = 2: 3: 4 and satisfying the parallel circuit ratio at the ratio of A2 group: B2 group: C2 group = 2: 3: 4 In the arrangement of a plurality of LED chips 101, not only the mirror arrangement but also the mirror arrangement for the parallel connection group are satisfied.

The condition satisfying the above-mentioned ratio of A1 group: B1 group: C1 group = 3: 3: 3 and satisfying the parallel circuit ratio at the ratio of A2 group: B2 group: C2 group = 2: 3: Is a condition for inducing more stable driving from the AC input voltage input through the first pin 121. [

The parallel circuit ratio can be defined as a ratio to the number of parallel lines formed by the connection of the LED chips 101 for each group.

Then, in the plurality of LED chips 101 having a circular chip-on-board (COB) arrangement connected in parallel with the serial, the serial circuits of the B1 group The ratio satisfies the condition that the ratio is larger and the series circuit ratio of the B2 group is larger than that of the A2 group and the C2 group.

The serial circuit ratio may be defined as the number or ratio of the LED chips 101 connected in series.

Here, the A1 group 131, the B1 group 132, and the C1 group 133, which are located on one side of the substrate 110 and arranged in the circular half area, and the C1 group 133, which is located on the other side of the substrate 110, The condition of the parallel circuit ratio and the serial circuit ratio for the A 2 group 141, the B 2 group 142 and the C 2 group 143 arranged in the other half area with respect to the COB LED 140 is the same for the AC COB LED 100 according to the present invention It is possible to derive the output of 120 ~ 180W, and it can be said that the optimum ratio condition for each group for the output of 120 ~ 180W.

Thus, by satisfying the conditions of the parallel circuit ratio and the serial circuit ratio, the AC COB LED 100 of the present invention can lower the failure rate while increasing the energy efficiency at the time of high power driving, .

In another embodiment, in each group of a plurality of LED chips 101 having a circular COB (Chip On Board) arrangement connected in parallel with the serial on the upper surface of the substrate 110, The parallel circuit ratio is satisfied at the ratio of B1 group: C1 group = 1: 2: 3 or 2: 2: 2, and the parallel circuit ratio is satisfied at the ratio of A2 group: B2 group: C2 group = 1: 2: .

The condition satisfying the above-mentioned ratio of A1 group: B1 group: C1 group = 1: 2: 3 and satisfying the parallel circuit ratio at the ratio of A2 group: B2 group: C2 group = 1: 2: It is a condition to satisfy not only the mirror image arrangement for the serial connection group formed by the series connection of each group in the array of the LED chips 101 but also the mirror arrangement for the parallel connection group by the parallel line for each group.

Here, the condition satisfying the ratio of A1 group: B1 group: C1 group = 2: 2: 2 and satisfying the parallel circuit ratio at the ratio of A2 group: B2 group: C2 group = 1: 2: Is a condition for inducing more stable driving from the AC input voltage input through the first pin 121. [

Then, in the plurality of LED chips 101 having a circular chip-on-board (COB) arrangement connected in parallel with the serial, the serial circuits of the B1 group The ratio satisfies the condition that the ratio is larger and the series circuit ratio of the B2 group is larger than that of the A2 group and the C2 group.

Here, the A1 group 131, the B1 group 132, and the C1 group 133, which are located on one side of the substrate 110 and arranged in the circular half area, and the C1 group 133, which is located on the other side of the substrate 110, The AC COB LED 100 (100) according to the present invention is provided with the parallel circuit ratio and the serial circuit ratio for the A2 group 141, the B2 group 142, and the C2 group 143 arranged in the other half region COB, ), And it can be said that the optimum ratio condition for each group for the output of 60W is possible.

Sometimes, as another embodiment, to increase the output of watts, the parallel circuit ratio is satisfied at the ratio of A1 group: B1 group: C1 group = 3: 4: 5 or 4: 4: 4, The ratio of the group: C2 group = 3: 4: 5 may be configured so as to satisfy the parallel circuit ratio. In this case, the serial circuit ratio will be the same as the above condition.

Thus, by satisfying the conditions of the parallel circuit ratio and the serial circuit ratio, the AC COB LED 100 of the present invention can lower the failure rate while increasing the energy efficiency at the time of high power driving, .

Further, the AC COB LED 100 according to the present invention has six LED groups (A1 group, B1 group, C1 group, C2 group, B2 group, A2 group) according to the electrode wiring method in an 8- It can be used according to the driving condition of ~ 127V or the driving condition of AC 200V ~ 277V.
For example, FIG. 2 shows a wiring system that can be used under driving conditions of AC 100V to 127V for six LED groups (A1 group, B1 group, C1 group, C2 group, B2 group, A2 group) The first pin 121 and the fifth pin 125 are matched to each other and connected to the input line of the AC voltage and the second pin 122 and the sixth pin 126 are matched to each other, The third pin 123 and the seventh pin 127 are matched to each other and the fourth pin 124 and the eighth pin 128 are matched to each other and connected to an output line of an AC voltage, Six LED groups (a group of LEDs) connected between the COB arrangement and the 8-pin electrodes on the substrate 110 under the driving conditions of AC 100 V to 127 V by distributing the pins 121 to 8 and connecting them in a parallel structure A1 group, B1 group, C1 group, C2 group, B2 group, A2 group).

 In addition, the AC COB LED 100 according to the present invention has a COB arrangement on the substrate 110 under the driving condition of AC 200 V to 277 V through the modification of the serial connection method in the 8-pin electrode structure, The B1 group, the C1 group, the C2 group, the B2 group, and the A2 group) connected to the first LED group (the first group).

delete

Here, an AC IC driver is used for driving the AC COB LED 100 according to the present invention.

FIG. 3 is an exemplary view showing an embodiment of a usage state of a circular COB arrangement using an LED chip 101 in an AC COB LED 100 using an 8-pin electrode structure according to an embodiment of the present invention. to be.

Here, the A1 group 131, the B1 group 132, and the C1 group 133, which have the 8-pin electrode structure and are connected to the first to fourth pins 121 to 124 by the LED chip 101 array, The A2 group 141, the B2 group 142 and the C2 group 143 by the LED chip 101 array connected to the fifth to eighth pins 125 to 128 are connected to each other, .

The A1 group 131 and the A2 group 141 which are mirror images of the upper surface of the substrate 110 show the structure of a two line parallel line and the B1 group 132 and the B2 group 142 are arranged in a three- Line structure, and the C1 group 133 and the C2 group 143 show the structure of a 4-line parallel line.

In this case, the A1 group 131 and the A2 group 141, which are arranged on the upper surface of the substrate 110 in an mirror image, show that thirteen LED chips 101 are connected in series to each other in the serial line. 132 and the B2 group 142 show that 16 LED chips 101 for each serial line are connected in series and the C1 group 133 and the C2 group 143 each have 13 LEDs And the chips 101 are connected in series.

In other words, the LED chip 101 may have a complete mirror-like arrangement symmetrically on the upper surface of the substrate 110. In a plurality of LED chips 101 having a circular COB (Chip On Board) arrangement connected in parallel with the serial (A2 group) and the C1 group (C2 group) satisfy the parallel circuit ratio at the ratio of A1 group (A2 group): B1 group (B2 group): C1 group ), The series circuit ratio of the B1 group (B2 group) is larger than that of the B1 group.

4 is an exemplary diagram showing another embodiment of the use state of the circular COB arrangement using the LED chip 101 in the AC COB LED 100 in which the 8-pin electrode structure according to the embodiment of the present invention is applied to be.

Here, the A1 group 131, the B1 group 132, and the C1 group 133, which have the 8-pin electrode structure and are connected to the first to fourth pins 121 to 124 by the LED chip 101 array, The A2 group 141, the B2 group 142 and the C2 group 143 by the LED chip 101 array connected to the fifth to eighth pins 125 to 128 are connected to each other, .

In this case, the A1 group 131, the B1 group 132, and the C1 group 133 all have the same three-line parallel line structure, the A2 group 141 has the structure of a two-line parallel line, The B2 group 142 shows the structure of a 3-line parallel line, and the C2 group 143 shows the structure of a 4-line parallel line.

In this case, the A1 group 131 and the A2 group 141 show that thirteen LED chips 101 are connected in series in each serial line, and the B1 group 132 and the B2 group 142 are 16 LED chips 101 for each serial line are connected in series, and the C1 group 133 and the C2 group 143 have 13 LED chips 101 connected in series for each serial line And show that they are mirror images of the serial connection group.

That is, the LED chip may be symmetrically arranged on the upper surface of the substrate 110 to have a mirror-like arrangement with respect to the series connection, and a plurality of LED chips having a circular chip-on-board (COB) 101), the parallel circuit ratio is satisfied in the ratio of A1 group (A2 group): B1 group (B2 group): C1 group (C2 group) = 3: 3: And the series circuit ratio of the B1 group (B2 group) is larger than that of the group (C2 group).

delete

That is, it will be apparent that modifications and variations may be made, for example, by changing the number of LED chips 101 used for serial-parallel connection within a range satisfying the parallel circuit ratio and the serial circuit ratio.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative, Substitution can be made, which will be within the technical scope of the present invention.

100: AC COB type LED 101: LED chip
110: substrate 121 to 128: 8-pin electrode
131: A1 group 132: B1 group
133: C1 group 141: A2 group
142: B2 group 143: C2 group

Claims (4)

An AC COB type LED having a chip on board (COB) array in which a plurality of LED chips are connected in series and in parallel,
In the upper surface of the substrate, a plurality of LED chips are connected in series and in parallel at a central portion and arranged in a circular COB (Chip On Board), and 8-pin electrodes are provided on both right and left sides with respect to a vertical center;
A plurality of LED chips each having a serial-parallel connection configuration are formed in three groups and connected to the first to fourth pins provided on one side of the substrate, and a plurality of LED chips arranged between the first and second pins A plurality of LED chip groups arranged between a second pin and a third pin are referred to as a B1 group, a plurality of LED chip groups arranged between a third pin and a fourth pin are referred to as a C1 group,
A plurality of LED chips each having a serial-parallel connection configuration are formed in three groups and connected to the fifth pin to the eighth pin provided on the other side of the substrate, and a plurality of LED chips arranged between the fifth pin and the sixth pin When a plurality of LED chip groups arranged between the sixth and seventh pins are referred to as a B2 group and a plurality of LED chip groups arranged between the seventh and eighth pins are referred to as a C3 group,
The A1 group, the B1 group, the C1 group, the A2 group, the B2 group, and the C2 group are divided into right and left regions based on a circular vertical center in the circular on-chip COB (Chip On Board)
The half area of the circle is connected in series from the outside to the center in the order of A1 group? B1 group? C1 group, and the other half area of the circle is connected from the outside to the center in the order of A2 group? B2 group? And the other side serial connection group formed by the A1 group, the B1 group, and the C1 group and the other side serial connection group formed by the A2 group, the B2 group, and the C2 group are arranged in symmetrical mirror images with each other ;
The A1 group: B1 group: C1 group = 2: 3: 4 or 3: 3: 3 for each group of the LED chips having the serial-parallel connection configuration constituting the circular COB (Chip On Board) , And satisfies the parallel circuit ratio in the ratio of A2 group: B2 group: C2 group = 2: 3: 4;
The serial circuit ratio of the B1 group is larger than that of the A1 group and the C1 group in each group of the plurality of LED chips having the serial-parallel connection configuration constituting the circular COB (Chip On Board) arrangement, And the series circuit ratio of the B2 group is larger than that of the A2 group and the C2 group.
An AC COB type LED having a chip on board (COB) array in which a plurality of LED chips are connected in series and in parallel,
In the upper surface of the substrate, a plurality of LED chips are connected in series and in parallel at a central portion and arranged in a circular COB (Chip On Board), and 8-pin electrodes are provided on both right and left sides with respect to a vertical center;
A plurality of LED chips each having a serial-parallel connection configuration are formed in three groups and connected to the first to fourth pins provided on one side of the substrate, and a plurality of LED chips arranged between the first and second pins A plurality of LED chip groups arranged between a second pin and a third pin are referred to as a B1 group, a plurality of LED chip groups arranged between a third pin and a fourth pin are referred to as a C1 group,
A plurality of LED chips each having a serial-parallel connection configuration are formed in three groups and connected to the fifth pin to the eighth pin provided on the other side of the substrate, and a plurality of LED chips arranged between the fifth pin and the sixth pin When a plurality of LED chip groups arranged between the sixth and seventh pins are referred to as a B2 group and a plurality of LED chip groups arranged between the seventh and eighth pins are referred to as a C3 group,
The A1 group, the B1 group, the C1 group, the A2 group, the B2 group, and the C2 group are divided into right and left regions based on a circular vertical center in the circular on-chip COB (Chip On Board)
The half area of the circle is connected in series from the outside to the center in the order of A1 group? B1 group? C1 group, and the other half area of the circle is connected from the outside to the center in the order of A2 group? B2 group? And the other side serial connection group formed by the A1 group, the B1 group, and the C1 group and the other side serial connection group formed by the A2 group, the B2 group, and the C2 group are arranged in symmetrical mirror images with each other ;
The A1 group: B1 group: C1 group = 1: 2: 3 or 2: 2: 2 for each group of LED chips having a serial-parallel connection configuration constituting the circular COB (Chip On Board) And a parallel circuit ratio is satisfied in a ratio of the A2 group: B2 group: C2 group = 1: 2: 3;
The serial circuit ratio of the B1 group is larger than that of the A1 group and the C1 group in each group of the plurality of LED chips having the serial-parallel connection configuration constituting the circular COB (Chip On Board) arrangement, And the series circuit ratio of the B2 group is larger than that of the A2 group and the C2 group. delete delete

Images